A buffer is prepared by mixing 0.2 moles of na2hpo4 and 0.1 mole nah2po4, pka 6.7. calculate the ph of this buffer
Answers
The pH of the buffer solution is approximately 7.001.
To calculate the pH of the buffer solution, we need to consider the Henderson-Hasselbalch equation, which relates the pH of a buffer to the pKa and the ratio of the concentrations of the acidic and basic components of the buffer.
The Henderson-Hasselbalch equation is:
pH = pKa + log ([A-]/[HA])
In this case, the acidic component is NaH2PO4 and its concentration is 0.1 mole, while the basic component is Na2HPO4 and its concentration is 0.2 moles.
First, we need to determine the ratio [A-]/[HA]. Since NaH2PO4 is a monobasic acid and Na2HPO4 is a dibasic salt, the ratio will be 2:1.
Now, let's substitute the values into the equation:
pH = 6.7 + log (0.2/0.1)
pH = 6.7 + log (2)
pH = 6.7 + 0.301
pH ≈ 7.001
Therefore, the pH of the buffer solution is approximately 7.001.
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Related Questions
According to the diagram which statement best describes what happens when two astronauts collide in space? Will give crown!!!!
Answers
Answer:
J. Their momentum is conserved
Explanation:
According to the diagram, the best statement that describes what happens when two astronauts collides in space is that their momentum is conserved.
The momentum before collision is 320kgkm/hr and after collision it is 320kgm/s
This collision is an inelastic collision;
momentum before = momentum after
m₁v₁ + m₂v₂ = v(m₁ + m₂)
m₁ = 80kg
v₁ = 4km/hr
m₂ = 80kg
v₂ = 0
v = 2km/hr
Insert the parameters;
(80 x 4) + (80 x 0) = 2(80 + 80)
320 = 320
Step 1: Gather materials and necessary information. a) You will collect the following information about your element: • Periodic table information including type of element, atomic number, atomic mass, number of protons, number of electrons, number of neutrons, period number, group number, and group name • Physical and chemical properties of the element • When, where, and by whom the element was discovered • Where the element is found and how it is obtained • Uses for the element and/or products made from the element • Images of the element b) Be sure to keep a list of your references so you can cite them later. c) Ask your teacher where you should save your presentation as you work on it. Your teacher may also have specific guidelines about the file name you should use.
Answers
Answer:
We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness.--That to secure these rights, Governments are instituted among Men, deriving their just powers from the consent of the governed, --That whenever any Form of Government becomes destructive of these ends, it is the Right of the People to alter or to abolish it, and to institute new Government, laying its foundation on such principles and organizing its powers in such form, as to them shall seem most likely to effect their Safety and Happiness. Prudence, indeed, will dictate that Governments long established should not be changed for light and transient causes; and accordingly all experience hath shewn, that mankind are more disposed to suffer, while evils are sufferable, than to right themselves by abolishing the forms to which they are accustomed. But when a long train of abuses and usurpations, pursuing invariably the same Object evinces a design to reduce them under absolute Despotism, it is their right, it is their duty, to throw off such Government, and to provide new Guards for their future security.--Such has been the patient sufferance of these Colonies; and such is now the necessity which constrains them to alter their former Systems of Government. The history of the present King of Great Britain is a history of repeated injuries and usurpations, all having in direct object the establishment of an absolute Tyranny over these States. To prove this, let Facts be submitted to a candid world.
There are various kind of elements that are present in periodic table. Some elements are harmful, some are radioactive, some are noble gases. Therefore, periodic table is the best platform to understand element.
What is periodic table?Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number.
Periodic table help a scientist to know what are the different types of elements are present in periodic table so that they can discover the new elements that are not being discovered yet.
Periodic table is the best platform to have a look to all elements at once that are arranged in columns and groups mentioning their valences, electronegativity and Ionisation energy symbols.
Therefore, periodic table is the best platform to understand element.
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By the way...... what do those symbols for the elements have in common (for number 7-11): Pb, Au, Cu, Hg, Na ? *
Answers
Answer:
those have symbols for their Latin or Greek name
Explanation:
hope it helps
Answer:
Na number of 11
Explanation:
Pb no. 82
Au no. 79
Cu no. 29
Hg no. 80
Carbon in the atmosphere is most often found as which of the following compounds? A. stratospheric ozone B. fossil fuel C. carbon monoxide D. carbon dioxide 4 3
Answers
Carbon in the atmosphere is most often found as carbon dioxide (CO2).
Carbon dioxide is a gaseous compound made up of carbon and oxygen elements. Carbon dioxide is released into the atmosphere during the following processes:Burning of fossil fuelsDecomposition of organic matterCellular respiration of living organismsVolcanic eruptionThe processes listed above releases carbon in the form of carbon dioxide (CO2) into the atmosphere, therefore, carbon in the atmosphere is most often found as carbon dioxide (CO2).Learn more at: https://brainly.com/question/19623598?referrer=searchResults
Emma drinks water from a glass using a straw. Which of these best describes how the fluid moves from the drinking glass to Emma’s mouth
Answers
Answer: The fluid moved from the glass to Emma's mouth due to reduced pressure in the mouth during the sucking process.
How do valence electrons affect ion formation?
Answers
Valence electrons affects ion formation by transferring from one atom to another atom.
Valence electrons are the outermost electrons in an atom and are involved in the formation of ions. Ions are atoms or molecules that have a net electric charge due to a surplus or deficiency of electrons. When an atom forms an ion, it either gains or loses electrons to achieve a more stable electron configuration. The number of valence electrons in an atom determines how easily it can gain or lose electrons to form ions. Atoms with few valence electrons, such as alkali metals, tend to lose those electrons easily to form positive ions. Atoms with many valence electrons, such as halogens, tend to gain electrons easily to form negative ions. The number of valence electrons also affects the charge of the ions that are formed. Atoms with fewer valence electrons will form ions with a higher charge, while atoms with more valence electrons will form ions with a lower charge.
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what happens to the boiling point of hydrocarbon compounds when the number of carbon atom increases
A. Decreases
B. Increases
C. Remains the same
D. None of these
I NEED YOUR ANSWER RN GUYSS PLEASEE
Answers
So therefore your answer choice will increase. (B)
formic acid is used in the venom of some species of ants. what is the ph of a 0.2 m solution of formic acid (ka
Answers
The pH of a 0.2 M solution of formic acid (Ka = 1.8x10-4) can be calculated using the Henderson-Hasselbalch equation: pH = pKa + log([A-]/[HA]). Plugging in the values gives us pH = 3.66.
The Henderson-Hasselbalch equation is used to calculate the pH of a weak acid solution. The equation states that pH = pKa + log([A-]/[HA]). Here, [A-] is the concentration of the conjugate base, and [HA] is the concentration of the weak acid. pKa is the acid dissociation constant of the weak acid. In this case, Ka = 1.8x10-4.
We can solve for pH by plugging in the values: pH = 1.8x10-4 + log([0.2]/[0.2]). This simplifies to pH = 3.66.
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Pls help! I'll give brainliest!
Draw a physical model that shows the reaction of zinc metal and hydrochloric acid (hydrogen chloride).
Zinc + Hydrochloric Acid → Zinc Chloride and Hydrogen Gas
Zn + 2HCl → ZnCl2 + H2
Be sure to label your model to clearly show how you are representing the atoms, how they are rearranged and that mass is conserved in the reaction.
I don't need it drawn, if you can just explain to me the reaction and what happens i can draw it. Please?
Answers
Answer:
sorry im not sure
Explanation:
a
Properties of a gas are..
-no definite shape or volume
-has definite shape, does NOT
-have definite volume
-has definite volume AND shape
-none of the above
ASAP need help
Answers
the answer would be none of the above.
None of the above I’m pretty sure
if it turned out instead that some carbon 14 from the environment had contaminated the charcoal from the last part, would the true age of the same be younger or older than we thought, or would our age estimate be unaffected?
Answers
It turned out instead that some carbon 14 from the environment had contaminated the charcoal from the last part, would the true age of the same be (lower) / estimation is younger than its true age Contaminated samples, naturally, will have inaccurate results.
Radiocarbon dating has revolutionized how we think about the last 50,000 years. In 1949, Professor Willard Libby established the first radiocarbon dates. He later won the Nobel Prize for his work on dating by contrasting the three distinct carbon isotopes. The number of protons in the nuclei of different isotopes of a given element are the same, but the number of neutrons varies. This indicates that they have distinct masses despite having extremely similar chemical properties.
The number superscript denotes the isotope's total mass. The heaviest isotope, 14C (radiocarbon), is radioactive while the lighter isotopes, 12C and 13C, are stable. This indicates that because its nucleus is so massive, it is unstable. 14C decomposes to nitrogen over time (14N). The majority of 14C is created in the upper atmosphere when neutrons from cosmic rays interact with 14N atoms. After that, it undergoes oxidation to produce 14CO2, which is released into the atmosphere where it mixes with 12CO2 and 13CO2. After being utilized by plants for photosynthesis, this CO2 moves up the food chain.
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The ion X2- belongs to an element in Group
Answers
Answer:
ion X²- an element in group VI A.
6. CH3-CH-CH-CH2-CH2-CH3 structure name
| Br
Answers
I’m the space provided below, show a correct numerical setup for calculating the total number of moles of ethylene glycol needed to prepare 2.50 liters of a 10.0 M solution?
Answers
2.50 litres of a 10.0 M solution require the preparation of 25.0 moles of ethylene glycol.
What is the recommended ratio of ethylene glycol to water?Excellent antifreeze, anti-boil, and anti-corrosive qualities are produced when antifreeze and water are mixed in a 50/50 ratio. The proportion of conventional ethylene glycol to water in severely cold conditions can reach 70% antifreeze, 30% water. The maximum antifreeze to water ratio when using DEX-COOL® is 60/40.
moles = concentration (M) x volume (L)
Given that the desired concentration is 10.0 M and the volume needed is 2.50 L, the setup for calculating the total number of moles of ethylene glycol can be written as:
moles = 10.0 M x 2.50 L
moles = 25.0 mol
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Aiyanna is wrapping gifts. She uses 6 in of ribbon on each gift. How many presents can she wrap of she has 13y of ribbon?
Answers
According to unit conversion and unitary method as 1 yard=12 inches and 1 gift is packed with 6 inches of ribbon she can pack 26 gifts with 13 yards of ribbon.
What is unit conversion?Unit conversion is defined as a multi-step process which involves multiplication or a division operation by a numerical factor.The process of unit conversion requires selection of appropriate number of significant figures and the rounding off procedure.
It involves a conversion factor which is an expression for expressing the relationship between the two units.A conversion ratio always has value which equals to one which indicates that numerator and denominator have values which are expressed in different units.
As 1 yard =12 inches so 13 yards=13×12=156 inches .Aiyanna uses 6 inches of ribbon for 1 gift , so for 156 inches, 156/6=26 gifts can be packed.
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PLSS HELP I NEED THIS ASAP!
Answers
The correctly identified subatomic particle with its charge is
Proton - Positive, Neutron -Neutral, Electron - Negative What is a neutron ?The British physicist James Chadwick made the neutron discovery in 1932.
Neutrons are neutral subatomic particles that are a part of every atomic nucleus, except the exception of regular hydrogen. Its rest mass of 1.67927980 10-27 Kg is slightly larger than a proton but 1838.68 times greater than an electron. It has no electricity charge. The dense inner core of the atom is where protons and neutrons, collectively referred to as nucleons, are linked together and account for 99.9% of the mass of the atom.
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The molar mass of carbon dioxide is 44.0 g/mol. How many moles of CO2 are present in a 58.4 gram sample of CO2
Answers
Answer:
1.33 moles CO2
Explanation:
The number you are converting is 58.4 g CO2, so you start with this value. The conversion factor is 44.0 g/mol CO2. In order to cross out the grams, the grams must go on the bottom of the conversion factor.
1 mol CO2
58.4 g CO2 x -------------------------- = 1.33 moles CO2
44.0 grams
The answer has three sig figs.
Which organism makes its own food
Answers
An organism that can manufacture food on its own utilising light, water, carbon dioxide, or other chemicals is known as an autotroph.
Explain about an autotroph?
An organism that can manufacture food on its own utilizing light, water, carbon dioxide, or other chemicals is known as an autotroph. Autotrophs are occasionally referred to as producers since they grow their own nourishment.
A living thing that does not consume other organisms but instead obtains its own nourishment from inorganic sources or the environment. A heterotroph is an organism that cannot synthesis organic compounds from inorganic material and must receive its organic food molecules by consuming the waste of other organisms.
Given that they produce their own sustenance through photosynthesis, the majority of plants are autotrophs. There are, however, exceptions to every rule. A host serves as the food source for some parasitic, non-photosynthetic plants.
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What makes the element oxygen different from the element hydrogen?
Answers
Answer: the difference is due to the fact that one water molecule has two hydrogen atoms to one oxygen this means it takes two water molecules (2 H2O) to make one oxygen molecule (02) .At the same time however two molecules of water (2 H20) can make two molecules of hydrogen (2 H20)
Explanation: hope this helped and mark me as brainliest please =)
what is the normal boiling point of toluene
Answers
The temperature is 110.6 °C. The normal "boiling point" of toluene is 110.6 °C.
A pure toluene's boiling point, 110.6° C (i.e. 231.1° F in Fahrenheit) is a colourless, flammable, insoluble in water, toxic liquid but soluble in all the common organic solvents.
And at higher altitudes, boiling point of the liquid decreases and lowers because the atmospheric pressure is lower and this depends on amount of impurities in liquids, along with the atmospheric pressure.
Toluene is a colorless, flammable liquid and sweet smelling with aromatic odor that derives from petroleum and coal tar. It is stated as aromatic hydrocarbon and the reason is "it has containing benzene ring", that causes the molecule to be extra and more stable than the other hydrocarbons.
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I need help with this for an assignment
Answers
hydrochloric acid reacts with sodium hydroxide to form sodium chloride (the salt) and water.
Explanation:
Sodium chloride is made up of Na+ cations from the base (NaOH) and CI-anions from the acid (HCI).
Hope this helped!
PLEASE HELPPPP
For each pair, predict which substance becomes more positively charged and which becomes more negatively charged when the two substances are rubbed together.
1. cotton, steel
2. cotton, silk
3. human hair, human hands (dry)
4. Teflon®,wood
5. glass, plastic wrap
Answers
1. Cotton is charged negatively while steel doesn't charge by rubbing. 2. cotton acquires negative while silk acquires positive charge. 3. human hair is negative charge while human hand is positively charged. 4. teflon gets negative charge while wood doesn't acquire charge. 5. glass acquires positive charge when rubbed with plastic wrap.
Triboelectric chargingThe transfer of electrons between two different materials occurs when they are rubbed together. The result is that the electron gainer becomes negatively charged and the electron loss becomes positively charged.Triboelectric effect, often referred to as triboelectric charging, is a form of contact electrification in which certain materials acquire an electrical charge after being cut off from another substance with which they had come into touch.According to a type of contact electrification known as the triboelectric effect, some materials acquire an electrical charge after being cut off from another substance with which they had come into touch.
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do you think it is likely that major volcanic eruption will occur on the mainland of the united states
Answers
Answer:
yes
Explanation:
Answer:
It would be very unlikely that a volcanic eruption will occur in the mainland (Midwest or surrounding) to occur.
Explanation:
The nearest platonic plates are in California in the triangle with Japan and China, the chances of earthquakes are also low in this area due to the fact that no plates could collide to produce an earthquake, or form a volcano.
Summarize the process of anabolism.
Answers
The process of anabolism is a metabolic pathway in which one or more molecules are used to synthesize more complex compounds.
What is anabolism?Anabolism refers to the chemical metabolic reactions that occur in biological systems which are aimed at generating complex molecules from simpler ones. This process is different from catabolism, which involves the release of energy to be used in the anabolic process.
Therefore, with this data, we can see that anabolism refers to the generation of complex molecules in biological systems by using the energy generated by catabolic reactions in the body.
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due today please help
if the half-life of a decaying isotope is 10 years which statement is true after 10 years
A. the relative numbers of atoms cannot be determined
B. the numbers of parent nuclei and daughter nuclei in a sample are equal
C. there are more parent nuclei in a sample
D. there are more daughter nuclei than parent nuclei in a sample
Answers
Answer:
The answer: is D. there are more daughter nuclei than parent nuclei in a sample.
Hope this help you enjoy :D
Explanation:
Answer:
B
Explanation:
Which of the following best accounts for why
malleability occurs?
(A) The highly flexible structure of the atoms due to lack
of an internal structure.
(B) The high potential energy of the substance due to the
free floating electrons.
(C) The ability of the cations to slide past one another due to the delocalization of the electrons.
(D) The repulsion of the cations for each other causes the solid to easily spread with little resistance.
Answers
The best explanation for malleability among the given options is (C) The ability of the cations to slide past one another due to the delocalization of the electrons. Option C
Malleability refers to the property of a substance to be deformed or shaped into different forms without breaking or cracking. In metallic substances, such as metals, the atoms are arranged in a closely packed lattice structure held together by metallic bonds.
These metallic bonds involve the delocalization of electrons, meaning that the valence electrons are not bound to specific atoms but instead move freely throughout the metal lattice.
The delocalization of electrons allows for the cations (positively charged ions) to slide past one another when a force is applied. As a result, the metal can be easily deformed into various shapes without disrupting the overall structure.
Option (A) is incorrect because atoms do have internal structures. Option (B) is not specific to malleability and refers more to the concept of potential energy. Option (D) does not accurately explain the mechanism behind malleability. Therefore, option (C) provides the most accurate explanation for why malleability occurs in metallic substances.
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The reactions: KIA CAB rona (1) A+B → D
--r1A=k2Aca CB^2 K1a=2 dm^6/mol^2.s1
(2) A+B+U
-r2A=k2Aca CB^2 k24=3 dm^6/mol^2-s Take place in the gas phase. It is suggested to use a membrane reactor to improve the selectivity to the Desired product (D) A. Propose the proper membrane configuration, ie. determine which species should be fed through the membrane. Justify your answer. B. Develop the algorithm to be used in polymath to plot the molar flow rates and the overall selectivity, Spu, as a function of membrane reactor volume
Answers
A) The membrane configuration for the given chemical reaction can be proposed by determining the difference in the partial pressure of the species between the two sides of the membrane.
B) To develop an algorithm for plotting the molar flow rates and the overall selectivity (SpU) as a function of membrane reactor volume, the following steps can be followed:
1. Calculate the values of the rate constants k2A and k2B using the given data.
2. Use the formula of molar flow rate to find the molar flow rate of species A, B, and D.
3. Use the formula of overall selectivity, SpU = (molar flow rate of D)/(molar flow rate of U), to find the overall selectivity as a function of membrane reactor volume.
4. Plot the molar flow rates of species A, B, and D, and the overall selectivity as a function of membrane reactor volume using a Polymath software.
A) To improve the selectivity to the desired product (D), the reactants must be fed through the membrane. This is because the reaction rate of reactants through the membrane is slower as compared to that of the product. This is because the diffusion coefficient of reactants is less than the diffusion coefficient of the product.
Thus, the product will pass through the membrane faster than the reactant. Therefore, feeding the reactant through the membrane would improve the selectivity to the desired product (D).
B) The algorithm to be used in Polymath can be given as follows:
1: Set the values of the rate constants k2A, k2B, and k24.
2: Calculate the molar flow rate of species A using the formula Qa = Ca0 - (Ca + Cd) / (1 / (k2A * Ca * Cb^2)).
3: Calculate the molar flow rate of species B using the formula Qb = Cb0 - (Ca + Cd) / (1 / (k2B * Ca * Cb^2)).
4: Calculate the molar flow rate of species D using the formula Qd = Cd / (1 / (k24 * Ca * Cb)).
5: Calculate the overall selectivity using the formula SpU = Qd / Qu.
6: Plot the molar flow rates of species A, B, and D, and the overall selectivity as a function of membrane reactor volume using Polymath.
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A cylinder of gas has a pressure of 4. 882 atm on one day. The next day, the same cylinder of gas has a pressure of 4. 690 atm, and its temperature is 8. 0 degrees celsius. What was the temperature (in degrees celsius) on the previous day?.
Answers
A cylinder of gas has a pressure of 4. 882 atm on one day, the temperature (in degrees celsius) on the previous day was 20 °C.
A unit called temperature is used to represent hotness or coolness on a variety of arbitrary scales. Additionally, it illustrates the transfer of heat energy organically.
We formula for,
\(\frac{P1}{T1} = \frac{P2}{T2}\)
We have,
Day one's pressure is 4.882 atm.
The following day's pressure is 4.690 atm.
The next day, with a pressure of 4.690 atm, the temperature is 8 °C.
We convert the degree into Kelvin,
8 + 273 = 281 K
Putting the values in the equation
\(\frac{4.882}{T1} = \frac{4.690}{281}\)
We get, T1 = 292.5K
293 K converting into Celsius
293 - 273 = 20 °C
Thus, the temperature on the previous day is 20 °C.
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what is the molecular formula of a compound that has a molecular mass of 92 and an empirical formula of no2?
Answers
The molecular formula of the compound will be N₂O₄.
To determine the molecular formula of the compound, we need to first find the empirical formula mass of the empirical formula NO₂.
Empirical formula mass = (atomic mass of N) + 2 x (atomic mass of O)
Empirical formula mass = (14.01 g/mol) + 2 x (16.00 g/mol)
Empirical formula mass = 46.01 g/mol
Next, we can calculate the ratio of the molecular mass to the empirical formula mass:
Ratio = Molecular mass/Empirical formula mass
Ratio = 92 g/mol / 46.01 g/mol
Ratio = 2
This means that the molecular formula of the compound contains twice as many atoms as the empirical formula. So, to find the molecular formula, we can simply multiply the subscripts in the empirical formula by 2.
Molecular formula = N₂O₄
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Which of the following is an adaptation of organisms in avoiding unfavorable condition due to a change in abiotic factor?
A. Migration of birds due to change in seasons.
B. Hibernation of a snake from September to December.
C. Plants die due to lack of water and high temperature.
D. Body temperature regulation of polar bears during winter
Volcanic eruption is considered as one of the changes in abiotic factors in the ecosystem. Which of the following is/are the effect/s of volcanic eruptions in the ecosystem?
A. I and II only
B. I and III only
C. II and III only
D. I, II, and III
Help plsssssss
Answers
The effects of volcanic eruption include acid rain and destruction of lives and property.
What are abiotic factors?The term abiotic factors refers to those factors that are non living such as rainfall, topography, etc. The adaptation of organisms in avoiding unfavorable condition due to a change in abiotic factor is hibernation of a snake from September to December.
A volcanic eruption is a sudden outburst of molten magma from the earth's crust. The effects of volcanic eruption include acid rain and destruction of lives and property.
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