Lactic acid (C3H6O3), which is found in sour milk and foods such as sauerkraut, is a weak monoprotic acid. The pH of a 0.10 M solution of lactic acid is 2.42.
Part A
What is the value of Ka for lactic acid?
Part B
What is the value of pKa for lactic acid?
Answers
1. Part A: The value of Ka for lactic acid is 1.44 x \(10^{-4}\).
2. Part B: The value of pKa for lactic acid is 3.84
To find the value of Ka for lactic acid, follow these steps:
Step 1: Write down the given information:
The concentration of lactic acid (\(C_{3}H_{6}O_{3}\)) = 0.10 MpH of the solution = 2.42
Step 2: Calculate the concentration of \(H^{+}\) ions using the pH formula:
pH = -log[\(H^{+}\)]
2.42 = -log[\(H^{+}\)]
[\(H^{+}\)] = \(10^{-2.42}\) ≈ 3.80 x \(10^{-3}\) M
Step 3: Write the balanced equation for the ionization of lactic acid:
\(C_{3}H_{6}O_{3}\) (aq) ↔ \(H^{+}\) (aq) + \(C_{3}H_{5}O_{3}^{-}\) (aq)
Step 4: Assume that the concentration of \(H^{+}\) ions is equal to the concentration of \(C_{3}H_{5}O_{3}^{-}\) ions, as they are produced in a 1:1 ratio:
[\(C_{3}H_{5}O_{3}^{-}\)] = [\(H^{+}\)] ≈ 3.80 x \(10^{-3}\) M
Step 5: Calculate the value of Ka using the expression for the equilibrium constant:
Ka = [\(H^{+}\)][\(C_{3}H_{5}O_{3}^{-}\)] / [C3H6O3]
Since [\(H^{+}\)] ≈ [\(C_{3}H_{5}O_{3}^{-}\)], we can use the same value for both:
Ka ≈ (3.80 x \(10^{-3}\))^2 / (0.10 - 3.80 x \(10^{-3}\))
Ka ≈ 1.44 x \(10^{-4}\)
Thus, the value of Ka for lactic acid is approximately 1.44 x \(10^{-4}\).
To find the value of pKa for lactic acid, use the following formula:
pKa = -log(Ka)
pKa = -log(1.44 x \(10^{-4}\))
pKa ≈ 3.84
Thus, the value of pKa for lactic acid is approximately 3.84.
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Related Questions
how many significant figures are in 823.012
Answers
please help me I need to know these answers rn A, B, OR C to each one
Answers
Answer:
First one
Explanation:
Because water molecules at the surface of the water puddle attract more to one other than they do to the air molecules above them
Answer:
Question 2:
Cohesion and adhesion
Water has forces of attraction between different molecules, so its molecules are locomotive.
Question 3:
Surface tension
It experiences a perpendicular force which keeps the area of the pepper on surface
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Which explains the charge of an ion of calcium (Ca)?
A. 2 electrons are gained by the atom.
B. 2 electrons are removed from the atom.
C. 2 protons are removed from the atom.
D. 2 protons are gained by the atom.
Answers
Answer:
B. 2 electrons are removed from the atom
Explanation:
The charge of an ion of calcium (Ca) is +2, which means that the calcium atom has lost 2 electrons.
Therefore, the correct answer is B. 2 electrons are removed from the atom.
The correct option is B. 2 electrons are removed from the atom.
Explanation:
Calcium (Ca) has an atomic number of 20, which means it has 20 electrons in its neutral state, arranged in shells around the nucleus. The electronic configuration of neutral calcium is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s².
When calcium loses two electrons from its outermost shell (4s²), it forms a calcium ion (Ca²⁺) with a noble gas electron configuration of argon. This is achieved by removing the two valence electrons from the 4s² subshell. The loss of two electrons from the neutral calcium atom leaves behind 18 electrons, but still 20 positively charged protons in the nucleus, giving the calcium ion a 2+ charge.
when a nucleide decays through beta decay it produces am-241. identify the parent nucleide.
Answers
The parent nucleide that decays through beta decay to produce Am-241 is Pu-241.
Beta decay is a type of radioactive decay in which a nucleus emits a beta particle, which is a high-energy electron or positron. In this process, a neutron in the nucleus is converted into a proton, and an electron or positron is emitted from the nucleus. In the specific case you mentioned, the Am-241 is produced as a result of beta decay of the parent nucleide Pu-241. During this process, a neutron in the nucleus of Pu-241 is converted into a proton, and an electron is emitted, resulting in the production of Am-241.
In summary, Pu-241 is the parent nucleide that decays through beta decay to produce Am-241. Beta decay is a type of radioactive decay in which a neutron is converted into a proton and an electron or positron is emitted from the nucleus.
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do equal volume of any gas under same temperature and pressure contain equal number of atoms? explain
Answers
what mass (in grams) of NH4Cl is needed to prepare 350 mL of a 0.25 M ammonium chloride solution
Answers
Answer:
4.70 grams of NH4Cl is needed to prepare 350 mL of a 0.25 M ammonium chloride solution.
We need approximately 4.68 grams of NH4Cl to prepare a 0.25 M ammonium chloride solution with a volume of 350 mL.
To determine the mass of NH4Cl needed to prepare the solution, we us use the formula:
m=M x V x MM ... (i)
where,
m= mass in grams
M=molarity of solution
MM= molar mass of compound
V= volume in litres
The number of moles of NH4Cl needed can be calculated using:
Moles = Molarity x Volume ...(ii)
Moles = 0.25 mol/L x 0.350 L
Moles = 0.0875 mol
Hence we can replace M x V with number of moles in equation i.
The molar mass of NH4Cl is :
Molar mass of NH4Cl = (1 x 14.01 g/mol) + (4 x 1.01 g/mol) + (1 x 35.45 g/mol)
Molar mass of NH4Cl = 53.49 g/mol
We have all the variables
Putting them in equation i.
Hence,
Mass (g) = Moles x Molar mass
Mass (g) = 0.0875 mol x 53.49 g/mol
Mass (g) = 4.68 g
Therefore, you would need approximately 4.68 grams of NH4Cl to prepare a 0.25 M ammonium chloride solution with a volume of 350 mL.
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Will the excited electron tay thi way? Why, why not? Ue your knowledge of attraction, electron and proton to explain what will happen next
Answers
By producing light, the electrons let off part or all of their extra energy.But an electron and a proton are attracted to one another.Another way to put it is that opposite charges attract each other whereas the same or "like" charges repel one another.
What takes place when protons and neutrons combine?Smaller subatomic particles make up protons and neutrons.Protons and neutrons exchange particles (mesons) when they are sufficiently close to one another, which fuses them together.When they are tied, it takes a lot of energy to unbind them.
A proton and an electron can they collide?No, I cannot.Because protons and electrons are separate species, this is the case.A proton and an electron can both annihilate with just an anti-proton (positron), but not the other way around.
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Summary
1.
Water is the most abundant substance on the surface of the earth.
About 71% of the earth's surface is covered by water.
2. Hydrogen is prepared in the laboratory by the action of zinc on
dilute hydrochloric acid or dilute sulphuric (VI) acid.
3. Hydrogen burns in oxygen to produce water. Water is an oxide
of hydrogen.
4. Active metals react with cold water to produce hydrogen gas
and the hydroxide of the metal in solution. Less active metals
react with steam to produce hydrogen and the oxide of the metal.
Copper and lead do not react with water.
5. Hydrogen is a reducing agent. It removes combined oxygen
from metal oxides of the less reactive metals.
6.
Reduction is the loss of oxygen from a compound. Oxidation is
the gain of oxygen by a substance.
7.
A reducing agent is a substance which removes oxygen from
another substance. An oxidising agent is a substance which gives
out oxygen to another substance.
when
water changes the
colour of coppe - 11
Revision Exercise sulphatorom blueto
1. (a) State the chemical tests for presence of water.
water change the color
(b) State the test, which is used to show that water is pure. Chistide paper from b
of copper anhydrous cobele
2.
Describe an experiment to show that water is an oxide of hydrogen.t non
3. State the precautions that must be taken when carrying out experiments with hydrogen.
Why is it not advisable to use iron in making steam boilers?
Write a word equation for a reaction in which hydrogen acts as a reducing agent.
Name the products formed when kerosene is burned in air.
State what is observed when a small piece of potassium is placed in water. Write a
word equation for the reaction.
Draw a labelled diagram to show how a reaction between steam and magnesium should
be carried out.
Describe how dry hydrogen is prepared in the laboratory.
Property of the Government of Kenya
Potassium
sodium
Calcim
Magne
Alun
Corbi
Zin
Answers
Explanation:
I know only one.You are in form.....
What is the balanced equation for
FeCl3 + H2S → Fe2S3 + HCI
Answers
Answer:
2FeCl3 + 3H2S → Fe2S3 + 6HCl
Explanation:
Answer:
2 FeCl3 + 3 H2S → 6 HCl + Fe2S3
......
hope this will help u buddy.....
F. According to the rules for naming compounds that you learned in this course, what is the
chemical name of this new product? What is its common name? (2 points)
Answers
Molecular compounds are termed by using the stem of the first element's name plus the suffix -ide, followed by the second element. Numerical prefixes are used to specify the number of atoms in a molecule.
What does "chemical common name" mean?The IUPAC defines a common name as one that clearly identifies a chemical but does not adhere to the current systematic naming convention. Acetone, which bears the scientific term, serves as an illustration of a common name. 2-propanone
What is the short answer to chemical?A chemical is any substance whose composition is known. A chemical always consists of the same "substance," to put it another way. Water is one of the substances found in nature.
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briefly describe the relationship between temperature and density of a gas
Answers
Answer:
Inversely proportional.
Explanation:
The density and temperature relationship for ideal gases is mathematically written as- Density and Temperature Relationship The density and temperature relation are proportionate. That is, the density is inversely proportional to temperature.
Select the correct answer. Samuel adds a teaspoon of salt to a glass of water. He notices that the salt disappears. Samuel takes a sip to discover that the water tastes salty. What kind of change has occurred? OA It's a chemical reaction because a new substance has formed. O B. It's a physical change because the water and the salt kept their original properties. O C. It's an example of synthesis because two substances reacted to give one substance. O D. It's a chemical reaction because the water now tastes salty but originally did not.
HELLLPPPP PLEASEEEEE!!!!!
Answers
Answer:
B. It's a physical change because the water and the salt kept their original properties.
Explanation:
Even though it tastes like salty water, the salt is still present, just in smaller molecules. It can be brought back so it is a physical change.
:
what is the name of this organic compound?
Answers
The name of the organic compound is 2-methyl pentane. The given organic compound is a five-carbon system with a substitution at the C-2 carbon. The naming of an organic compound is done according to the rules given by IUPAC.
The given organic compound has 5 carbon in its main chain. So It has the root word Pent. Since, all the bonds are single bonds, the organic compound is saturated, hence it has the suffix -ane. Hence the unsubstituted straight chain is pentane.
Numbering is done from right to left, because when the numbering is from right to left, the substituted carbon gets C-2, when it is numbered from left to right, the substituted carbon gets C-4. So the numbering is from the right and the substituted carbon is C-2. The substituent is a single carbon system, a methyl substituent. So the organic compound is named 2-methyl pentane .
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How can you show using Pauli's exclusion principle that p sub shell can have only 6 electrons?
Answers
where l = subshell value.
"l"values of subshell are.
s = 0.
p = 1.
d = 2.
f = 3.
So in p orbital we have 6 electrons.
(c) Is the value of the equilibrium constant, K, for the reaction greater than 1, or less than 1 ? Justify your answer.
Answers
The equilibrium constant, K, is a value that indicates the extent to which a reaction will proceed towards products at equilibrium.
If the value of K is greater than 1, it means that the products are favored at equilibrium, indicating that the reaction will proceed more towards products. On the other hand, if the value of K is less than 1, it means that the reactants are favored at equilibrium, indicating that the reaction will proceed more towards reactants.
To determine whether the value of K is greater than 1 or less than 1 for a specific reaction, we need to look at the balanced chemical equation for the reaction and calculate the equilibrium constant using the concentrations or pressures of the reactants and products at equilibrium. Without knowing the specific reaction, we cannot provide a definitive answer.
To determine if the value of the equilibrium constant, K, for the reaction is greater than 1 or less than 1, you need to consider the relationship between the concentrations of products and reactants at equilibrium. The equilibrium constant, K, is defined as the ratio of the concentrations of products to the concentrations of reactants, raised to the power of their respective stoichiometric coefficients.
If K > 1, it indicates that the concentration of products is greater than the concentration of reactants at equilibrium, meaning the reaction favors the formation of products.
If K < 1, it indicates that the concentration of reactants is greater than the concentration of products at equilibrium, meaning the reaction favors the formation of reactants.
In order to justify the value of K for the given reaction, you would need the equilibrium concentrations of the products and reactants or other information that allows you to determine the ratio of product concentrations to reactant concentrations at equilibrium.
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why is edta used to determine the hardness of water
Answers
EDTA (ethylenediaminetetraacetic acid) is commonly used to determine the hardness of water due to its ability to form complexes with metal ions, particularly calcium and magnesium ions.
Water hardness refers to the concentration of calcium and magnesium ions present in water. These ions can cause scaling, reduce the effectiveness of soaps, and have other negative effects. EDTA acts as a chelating agent, meaning it can bind to metal ions and form stable complexes.
In the process of determining water hardness, a known amount of EDTA solution is added to a water sample. The EDTA molecules form complexes with the calcium and magnesium ions present in the water.
The endpoint of the titration is reached when all the metal ions are complexed by the EDTA, resulting in a color change or an indicator reaching a specific endpoint.
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ct of the reaction of α‑d‑allose with methyl iodide (excess) and ag2o ? draw the expected product by replacing the missing substituents.
Answers
The reaction leads to the introduction of a methyl group onto the sugar molecule, resulting in a modified α-d-allose structure.
The reaction of α-d-allose with excess methyl iodide and \(Ag_2O\) (silver(I) oxide) is known as an alkylation reaction. In this reaction, the hydroxyl group present in the α-d-allose molecule is substituted with a methyl group due to the strong electrophilic nature of methyl iodide.
The reaction proceeds as follows: The silver(I) oxide acts as a base and removes a proton from the hydroxyl group, generating water and an alkoxide ion. The alkoxide ion then undergoes an S N2 reaction with methyl iodide, where the iodide ion is displaced and the methyl group attaches to the carbon atom bearing the hydroxyl group. This results in the formation of a methylated derivative of α-d-allose.
The expected product can be drawn by replacing the hydroxyl group (-OH) of α-d-allose with a methyl group. The carbon atom originally bonded to the hydroxyl group now bears the methyl group, while the remaining carbon atoms of the sugar structure remain unchanged.
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A car begins at rest and rolls down a hill and reaches a velocity of 95 m/s after 10 seconds. What is the car's acceleration?
Answers
Answer:
The car has an acceleration of 9.5m/s²
Explanation:
Since:
a= change in velocity / change in time
a= 95m/s / 10s = 9.5 m/s²
Why do compounds of metals and nonmetals consist of ions.
Answers
Compounds of metals and nonmetals consist of ions because of the difference in electronegativity between the two types of elements.
Metals tend to have a low electronegativity, which means they have a tendency to lose electrons and form positive ions, also known as cations. Nonmetals, on the other hand, tend to have a high electronegativity, which means they have a tendency to gain electrons and form negative ions, also known as anions.
When a metal and nonmetal combine in a compound, the metal loses electrons to the nonmetal, forming cations and anions, which then attract each other due to their opposite charges and form an ionic bond.
This results in the compound consisting of ions. In summary, the difference in electronegativity between metals and nonmetals is the reason why compounds of metals and nonmetals consist of ions.
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Arrange the organic compounds from most soluble in water to least soluble in water: Most soluble in water Least = soluble in water...
Answers
Alcohol is more soluble in water than ether. And CH4 is non polar. So, CH4 will be almost insoluble water.
CH3OH - most soluble
CH3-O-CH3 - second
CH4 - least soluble.
Solubility is defined as the maximum amount of a substance that will dissolve in a specified amount of solvent at a specified temperature. Solubility is a characteristic property of a particular solute/solvent combination, and different substances have very different solubilities.
Solubility can be expressed in grams of solute in one liter of saturated solution. For example, the solubility in water at 25 oC is 12 g/L. Molar solubility is the number of moles of solute per liter of saturated solution. For example, 0.115 mol/L at 25 oC
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What is the alveolar ventilation rate of a person that has a tidal volume of 450 ml, a dead space volume of 125 ml, and a is breathing 15 breaths/min
Answers
Answer:
Total minute ventilation is comprised of dead space plus alveolar ventilation. Minute ventilation is respiratory frequency (14 breaths per minute) multiplied by tidal volume (450 mL/breath) = 6300 mL/min.
Explanation:
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TEST QUESTION PLS HELP What are isotopes? Write isotopes of three different elements, showing their atomic number and mass number. (I'll give brainliest)
Answers
Answer:
Isotopes are members of a family of an element that all have the same number of protons but different numbers of neutrons. The number of protons in a nucleus determines the element's atomic number on the Periodic Table
Explanation:
Hope this helps some? :)
how many protons does Beryllium have?
Answers
Answer:
4
Explanation:
its a rare element, usually occurring as a product of the spallation of larger nuclei that have collided with cosmic rays
is CO(NH2)2 and (NH2)2CO the same thing
Answers
Answer:
Explanation: the answer is YES
CO(NH2)2 and (NH2)2 CO is the urea
Lily replicates an experiment that found that the number of calories in a particular food is 50 kcal. She obtained data from
five trials: 50 kcal 72 kcal, 50 kcal, 12 kcal, and 50 kcal. Which best desribes her data results? A. accurate B. incorrect C. invalid D. precise
Answers
Answer:
invalid
Explanation:
Just imagine doing this experiment MULTIPLE TIMES and one of the trials you get 72 Kcal while in another u get 12kcal. It doesn't make sense. Somewhere in the experiment she went wrong. So its invalid
True or False: The periodic table has changed very little since it was originally developed by Mendeleev and Meyer.
Answers
The periodic table has changed very little since it was originally developed by Mendeleev and Meyer is referred to as a false statement.
What is a Periodic table?
This is defined as the arrangement of elements based on their atomic number in a tabular form. It consists of 18 vertical columns which re referred to as groups and seven horizontal rows called period.
Henry Moseley in 1913 organized Mendeleev's periodic table based on physical properties.This took into consideration their atomic number rather than atomic mass and other missing elements.
This is the periodic table which is used currently and therefore hasn't changed much which is why false was chosen.
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Read this for the next two problems: When a 125 g obsidian rock is placed into
a graduated cylinder, the water level rises from the 15 mL to the 47 mL mark.
Answers
Answer:leeeeeee
Explanation:
When Boiling water,bubbles start to appear in the water and a gas rises from the surface. In 5 complete sentences, explain whether this is a physical or chemical change and WHY.
Answers
Answer:
Explanation:
Boiling is the rapid vaporization of a liquid, which occurs when a liquid is heated to its boiling point, the temperature at which the vapour pressure of the liquid is equal to the pressure exerted on the liquid by the surrounding atmosphere. There are two main types of boiling: nucleate boiling where small bubbles of vapour form at discrete points, and critical heat flux boiling where the boiling surface is heated above a certain critical temperature and a film of vapor forms on the surface. Transition boiling is an intermediate, unstable form of boiling with elements of both types. The boiling point of water is 100 °C or 212 °F but is lower with the decreased atmospheric pressure found at higher altitudes.
Boiling water is used as a method of making it potable by killing microbes and viruses that may be present. The sensitivity of different micro-organisms to heat varies. But if water is held at 100 °C (212 °F) for one minute, most micro-organisms and viruses are inactivated. Ten minutes at a temperature of 70 °C (158 °F) is also sufficient for most bacteria.
Boiling water is also used in several cooking methods including boiling, steaming and poaching.
what are the three different type of solution?explain them.
Answers
Answer:
Click at the above pic and the ans will appear.
Hope it helps :)
explain the difference between a mixture of a element and a compound made of elements. Write about atom in your answer
Answers
Answer:
A mixture of an element and a compound made of elements are two different types of combinations of matter.
An element is a substance that cannot be broken down into simpler substances by chemical means. Atoms are the smallest units of elements that still retain their properties. For example, gold is an element with the symbol Au, and its atoms cannot be broken down into simpler substances without losing their properties.
A compound, on the other hand, is a substance made up of two or more different elements chemically combined in a fixed ratio. For example, water is a compound made up of two hydrogen atoms and one oxygen atom, with the chemical formula H2O.
A mixture of an element and a compound is a combination of two or more substances that are physically mixed together, but not chemically combined. The substances in the mixture retain their individual properties and can be separated by physical means, such as filtering or evaporation. For example, a mixture of salt (a compound) and iron filings (an element) can be physically separated by using a magnet to attract the iron filings, leaving the salt behind.
In summary, the difference between a mixture of an element and a compound made of elements is that the former is a physical combination of two or more substances that retain their individual properties, while the latter is a chemical combination of two or more elements in a fixed ratio that results in a new substance with its own distinct properties.