Which will have a pH of 2?I. 10.0 cm3 of a solution of 0.01 mol dm−3 hydrochloric acid, HCl(aq).II. 1000 cm3 of a solution of 0.02 mol dm−3 hydrochloric acid, HCl(aq).III. 500 cm3 of a solution of 0.01 mol dm−3 hydrochloric acid, HCl(aq).I and III onlyI and II onlyII and III onlyI , II and III
Answers
Out of the given options, only option I and III have a pH of 2. This is because the pH of a solution is determined by the concentration of hydrogen ions (H+) in the solution. Hydrochloric acid (HCl) is a strong acid and fully dissociates in water to release hydrogen ions. Therefore, the concentration of hydrogen ions in a hydrochloric acid solution is equal to the concentration of the acid.
Option I has a smaller volume of hydrochloric acid solution, but it has a higher concentration of 0.01 mol dm−3. This means that it has a higher concentration of hydrogen ions, leading to a lower pH of 2.
Option III has the same concentration of hydrochloric acid as option I, but it has a larger volume of 500 cm3. This means that it has a lower concentration of hydrogen ions compared to option I, but still enough to have a pH of 2.
Option II has a higher concentration of 0.02 mol dm−3, but it has a much larger volume of 1000 cm3. This leads to a lower concentration of hydrogen ions and a higher pH of around 2.7.
In summary, the concentration and volume of the hydrochloric acid solution are important factors in determining the pH of the solution. Options I and III have the same concentration of 0.01 mol dm−3 but differ in volume, leading to the same pH of 2. Option II has a higher concentration but a larger volume, leading to a higher pH of around 2.7.
To know more Hydrochloric acid (HCl) click this link-
brainly.in/question/11825459?
#SPJ11
Related Questions
Balance the following reaction. Choose “blank” if no coefficient is needed.
C^2H^5 + O^2 ➡️CO^2 + H^2O
Answers
Answer:
Explanation:
4 C2H5 + 11 O2 --> 6 CO2 + 10 H2O
Picture shown!
What is 155.4/8.70 mL rounded to the correct number of significant figures?
a 18 g/mL
b 20 g/ml
C 17.9 g/ml
D 17.86 g/mL
Answers
Answer:
17.86g/ml[d]
Explanation:
155.4g/8.70=d
d=17.86g/ml
If you find this helpful,
please follow me
for more answers
to your questions
thank you
SHOW WORK
Calculate the morality
10.0 g of sodium chloride is dissolved in 2.0 L of solution.
Answers
Observations lead to questions. Good scientific questions need to be ___________.
straightforward
testable
inferred
spontaneous
Answers
Answer:
I think the answer would be 'testable'.
What particle determines the name/identity of the element?
Answers
Answer:
Number of protons
Explanation:
The number of protons in one atom of an element determines the atom's identity, and the number of electrons determines its electrical charge.
adding+specimen+scrapings+to+10%+koh+to+show+the+presence+of+sclerotic+bodies+that+resemble+copper+pennies+is+useful+in+the+diagnosis+of:
Answers
Adding specimen scrapings to 10% KOH to show the presence of sclerotic bodies that resemble copper pennies is useful in the diagnosis of tinea versicolor.
Tinea versicolor is a superficial fungal infection caused by the yeast Malassezia. The characteristic coppery or hypopigmented (lighter) spots seen in tinea versicolor are due to the accumulation of fungal cells on the skin. These cells, known as sclerotic bodies or spaghetti and meatballs, are visualized when the specimen scrapings from the affected area are mixed with 10% KOH. The KOH helps to dissolve the keratin in the skin, making it easier to identify the fungal elements under a microscope.
This diagnostic method is particularly effective for tinea versicolor because the presence of these distinctive sclerotic bodies confirms the diagnosis. Other skin conditions may have different appearances or lack these specific fungal elements when examined using the KOH preparation technique. Therefore, this test can aid in differentiating tinea versicolor from other skin conditions with similar clinical manifestations.
To know more about microscope, visit:
https://brainly.com/question/1869322
#SPJ11
a city council is debating between two potential water purification systems: reverse osmosis and ion exchange. cost is the primary criteria for the choice. which decision is the most likely result of this debate?(1 point)
Answers
It is likely that they would choose the ion exchange system as the most cost-effective option for water purification, provided it meets their specific water quality requirements.
Based on the student question, it appears that the city council is considering two water purification systems, reverse osmosis and ion exchange, with cost being the primary criterion for their decision.
In this scenario, the most likely result of the debate would be the selection of the water purification system with the lowest overall cost, taking into account both initial investment and ongoing operational expenses. To determine this, the city council would need to conduct a thorough cost analysis of each system.
Reverse osmosis is a process that uses pressure to force water through a semi-permeable membrane, removing contaminants and impurities. It is an effective method for purifying water, but the process can be energy-intensive and may require significant infrastructure investments, such as high-pressure pumps and specialized membranes. Additionally, ongoing costs can be high due to membrane replacement and energy usage.
for more such questions on water quality :
https://brainly.com/question/23717398
#SPJ11
1
Select the correct answer.
Which type of energy is thermal energy a form of?
OA.
chemical energy
B.
kinetic energy
O c.
magnetic energy
OD
potential energy
Reset
Next
Answers
Answer:
i think kinetic energy sorry if I'm wrong.
To which number set(s) does the following number belong?
-11
Answers
Answer:
Give a brief question
Not an awful question
Did I do number one correctly???
Answers
Explanation:
yup you are right. The answer is 2,3- Dimethyl butane
25 points!! PLEASE HELP
(SHOW WORK)
. How many molecules of N2 are produced when 15.9g of NO reacts with NH3?
4NH3 (g) + 6NO (g) → 5N2 (g) + 6H2O (g)
. How many molecules of N2 are produced when 15.9g of NO reacts with NH3?
4NH3 (g) + 6NO (g) → 5N2 (g) + 6H2O (g)
Answers
Molar mass of NO (NO): 30.01 g/mol
Molar mass of NH3 (NH3): 17.03 g/mol
15.9 g of NO = 15.9 g / 30.01 g/mol = 0.530 moles of NO
Assuming excess NH3, moles of N2 produced = moles of NO consumed
From the balanced chemical equation, we see that 6 moles of NO produces 5 moles of N2.
6 moles of NO = 5 moles of N2
0.530 moles of NO = (5/6) * 0.530 = 0.4417 moles of N2
Now, we can use Avogadro's number to convert moles to molecules:
1 mole of any gas contains 6.022 x 10^23 molecules
0.4417 moles of N2 = 0.4417 mol x 6.022 x 10^23 molecules/mol = 2.657 x 10^23 molecules of N2
Therefore, 2.657 x 10^23 molecules of N2 are produced.
This is the same question as the first one, so the answer would be the same:
2.657 x 10^23 molecules of N2 are produced
9.0 mol Na2S can from 9.0 mol CuS and 8.0 mol CuSO4 can form 8.0 mol Cus.
What mass of Cus forms during the reaction?
Cus; 95.62 g/mol
Answers
Answer:
765.0 grams CuS
Explanation:
The limiting reagent is the reactant which completely reacts before the other reactant(s) is used up. When 9.0 moles Na₂S and 8.0 moles CuSO₄ react, it appears that CuSO₄ is the limiting reagent. You can tell because it results in the production of less product.
You can determine the mass of CuS by multiplying the moles by the molar mass. It is important to arrange the ratio in a way that allows for the cancellation of units.
Molar Mass (CuS): 95.62 g/mol
8.0 moles CuS 95.62 g
------------------------- x ----------------------- = 765.0 grams CuS
1 mole
energy investment in the first stage of glycolysis requires glucose to be and cleaved to yield two molecules.
Answers
Energy investment in the first stage of glycolysis requires glucose to be phosphorylated and cleaved to yield two molecules.
Glycolysis is a metabolic pathway that converts glucose into two molecules of pyruvate in the presence of oxygen or two molecules of lactate in the absence of oxygen.
The metabolic pathway that converts glucose to pyruvate is known as glycolysis. This free energy is used to create the high-energy molecules adenosine triphosphate and reduced nicotinamide adenine dinucleotide. Glycolysis is a series of ten enzyme-catalyzed reactions. The process occurs in a cell's cytoplasm and does not require oxygen. It can be found in aerobic and anaerobic organisms. Phosphorylation traps glucose with the help of the enzyme hexokinase.
To learn more about glycolysis, here
https://brainly.com/question/14076989
#SPJ4
If u have 10 moles of C2H2 how many mole of O2 would you need
Answers
Answer:
i dont know04487448700
PLEASE HELPPP ITS DUE SOON
Answers
Answer:
it is a. i know I am right.
Explanation:
An example of a change of state is __________. *
liquid filling a glass
paper burning
ice cubes melting
Answers
Answer:
ice cube melting
Explanation:
bcoz it's a chemical change
Calcocite is a mineral composed of 79.9 mass % copper and 20.1 mass % sulfur. Determine the empirical formula for Calcocite.
Answers
we write the empirical formula using the mole ratios as subscripts: Empirical formula of Calcocite = Cu2STherefore, the empirical formula for Calcocite is Cu2S.
Calcocite is a mineral composed of 79.9 mass % copper and 20.1 mass % sulfur. To determine the empirical formula for Calcocite, we must first determine the mole ratios of copper and sulfur in the mineral.
Here's how: Step-by-step explanation:
We assume a 100 g sample of Calcocite.
Then, the mass of copper in the sample is 79.9 g (79.9 mass % of 100 g) and the mass of sulfur in the sample is 20.1 g (20.1 mass % of 100 g).Next, we find the moles of copper and sulfur using their atomic masses:
Moles of copper = 79.9 g / 63.55 g/mol (atomic mass of copper)
= 1.257 moles Moles of sulfur
= 20.1 g / 32.06 g/mol (atomic mass of sulfur)
= 0.626 moles
Then, we divide each mole value by the smallest mole value to get the simplest whole-number ratio of moles:
Moles of copper / Smallest mole value
= 1.257 / 0.626
= 2.007 Moles of sulfur / Smallest mole value
= 0.626 / 0.626
= 1.000 (Note that we rounded off the mole ratio of copper to two decimal places, which may introduce some errors in our calculation.
However, we will use this rounded value to make our empirical formula easier to write.)
Finally, we write the empirical formula using the mole ratios as subscripts: Empirical formula of Calcocite = Cu2STherefore, the empirical formula for Calcocite is Cu2S.
To know more about Calcocite visit;
brainly.com/question/32820442
#SPJ11
Molecular formula of nitrogen
Answers
Answer:-
The chemical symbol for nitrogen is N2 the chemical formula for nitrogen gas is N2
Explanation:-
The chemical formula for nitrogen gas is N2. Nitrogen gas is one of the diatomic elements, in which one molecule consists of two atoms of the same element bonded by one or more covalent bonds.
understand more:-
https://pubchem.ncbi.nlm.nih.gov/compound/Nitrogen
https://youtu.be/wp_7CVW6-UE
Answer: The molecular formula of nitrogen is N2.
Explanation: The atomic number of nitrogen is 7 as it is the 7th element of the periodic table and its molecular weight is 28.
nitrogen (N), a nonmetallic element of Group 15 [Va] of the periodic table. It is a colorless, odorless, tasteless gas that is the most plentiful element in Earth's atmosphere and is a constituent of all living matter.
#SPJ10 #SPJ12
What type of solution is formed when 20g of NaCl is heated to 80 degrees?
Answers
Answer:
As temperature increases, its solubility increases as well. Notice, however, that it does not increase significantly. In fact, you can expect to be able to dissolve no more than 40 g of sodium chloride per 100 g of water at 80∘C
Explanation:
HOPE THIS HELPS !
What is the molarity of a solution composed of 6.25 g of HCl in 0.300 L ofsolution?
Answers
The concentration is measured by molarity, the formula of molarity is:
\(\text{Molarity (M)=}\frac{mole\text{s of solute}}{liters\text{ of solution}}=\frac{mol}{L}.\)Based on the given data, we've already had the volume in liters and we have to convert 6.25 grams of HCl to moles. We have to use the molar mass of HCl which is 36.4 g/mol (you can find the molar mass using the periodic table). The conversion would be:
\(6.25\text{ g HCl}\cdot\frac{1\text{ mol HCl}}{36.4\text{ g HCl}}=0.172\text{ moles HCl.}\)And the final step is to replace the values we have in the formula of molarity:
\(\text{Molarity}=\frac{0.172\text{ moles}}{0.300\text{ L}}=\text{0}.573\text{ M.}\)The molarity of 6.25 g of HCl in 0.300 L of solution is 0.573 M.
how did the change of stress (adding or removing reactants or products) cause a shift in the equilibrium system of your solutions (in which direction)? hint: check the color changes to see the shift include a trial that demonstrated this change: stressequilibrium shifts to the: (left or right)trial that is an example of this:adding a reactantadding a productremoving a reactantremoving a product
Answers
When a stress is added or removed from an equilibrium system, the system will shift in order to relieve that stress and establish a new equilibrium.
If a reactant is added, the equilibrium will shift to the right to consume the added reactant. Conversely, if a product is added, the equilibrium will shift to the left to consume the added product. The same is true if a reactant or product is removed: the equilibrium will shift to the side that will replenish what was lost. This shift can often be observed through a change in color or other observable properties of the solution.
For example, if we have a solution of FeSCN2+ that is initially reddish-brown, adding more Fe(NO3)3 will shift the equilibrium to the right, resulting in a deeper red color. Conversely, removing some of the SCN- will shift the equilibrium to the left, resulting in a lighter color.
Changes in stress, such as adding or removing reactants or products, can cause shifts in the equilibrium system of solutions according to Le Châtelier's principle. When a reactant is added, the equilibrium shifts to the right, favoring the formation of products. Conversely, when a product is added, the equilibrium shifts to the left, favoring the formation of reactants. Removing a reactant shifts the equilibrium to the left, while removing a product shifts it to the right.
For example, in a trial where a reactant was added, the equilibrium shifted to the right, while a color change indicated the formation of more products. Similarly, in another trial where a product was removed, the equilibrium also shifted to the right, compensating for the loss of product by forming more. Observing these shifts helps us understand how systems respond to changes in stress.
To know about equilibrium :
https://brainly.com/question/30694482
#SPJ11
Please help me on numbers 1-4!!
Answers
a derived unit is a unit derived by fundamental units of lengths ,mass and time
so measurements
Use the pictures shown to identify three ways of drawing hydrocarbon molecules.
Then write the molecular formulas. (1 point each)
Answers
Answer:
The three ways to in which the hydrocarbons are represented are;
a. The ball and stick model
b. Condensed structural formula
c. Skeletal structure
The molecular formula are
a. C₇H₁₆
b. C₆H₁₄
c. C₅H₁₂
Explanation:
a. The ball and stick model of organic compounds, displays the atoms and bonds in three dimensions, representing the atoms by spares and the bonds by rods
b. The condensed structural formula are similar to the structural formula with the difference that the formula is written in a linear fashion which conserves space and increases ease of writing and are written out faster.
c. In the skeletal structure diagram, the atoms are of the organic compound are combined together in the structural drawing of the essential features of the organic compound. In essence, a skeletal structure, depicts the skeleton of a compound as it is made up of the molecule's skeletal atoms.
The three ways in which the hydrocarbons are represented are:
a. The ball and stick model
b. Condensed structure
c. Skeletal structure
The molecular formula are
a. C₇H₁₆
b. C₆H₁₄
c. C₅H₁₂
Let us understand these models and forms one by one:
a. The ball and stick model of organic compounds, displays the atoms and bonds in three dimensions, representing the atoms by spares and the bonds by rods.
b. The condensed structural formula are similar to the structural formula with the difference that the formula is written in a linear fashion which conserves space and increases ease of writing and are written out faster.
c. In the skeletal structure diagram, the atoms are of the organic compound are combined together in the structural drawing of the essential features of the organic compound. In a skeletal structure, depicts the skeleton of a compound as it is made up of the molecule's skeletal atoms.
Learn more:
brainly.com/question/21414230
according to the octet rule, a calcium atom has a tendency to
Answers
The octet rule states that atoms tend to react with other atoms in order to complete an outer electron shell of eight electrons. This is why calcium (Ca) atoms typically have a tendency to form ionic bonds with other atoms, gaining or losing electrons to achieve an outer shell of eight electrons.
Calcium is in group two of the periodic table and has an atomic number of 20. This means that its outer electron shell consists of two electrons. As a result, calcium needs to gain six electrons to complete its outer shell. By forming an ionic bond with another atom, calcium can gain the electrons it needs to complete its octet. This is why calcium atoms typically have a tendency to form ionic bonds.
Calcium can also form covalent bonds, where it shares electrons with other atoms. In this case, calcium atoms would only need to gain four electrons to complete their outer shell, and so calcium atoms can gain or lose electrons in order to achieve this.
For more such questions on octet rule, click on:
https://brainly.com/question/31020958
#SPJ11
Se prepara 0,150dm3 de solucion poh=11,20 a partir de 10,00cm3 de una solucion acuosa de hno3 (( m=63,0g/mol). la concentracion de la solucion concentrada expresada en %m/v es?
Answers
Answer:
Translate your language to English ok
The chemical isoamyl acetate C7H14O2 gives the odor of pears. What is the percent oxygen in isoamyl acetate?
Answers
Answer:
\(\% O=24.6\%\)
Explanation:
Hello!
In this case, since the by-mass percent of an element in a compound is computed by taking into account its atomic mass, the number of atoms in the molecules and the molar mass of the compound, we can write:
\(\% O=\frac{2*16.00}{130.18 } *100\%\\\\\% O=24.6\%\)
Best regards!
Why would researchers try to determine the initial rate of enzyme activity (V0) at a very early time point in the reaction
Answers
Researchers would try to determine the initial rate of enzyme activity (V0) at a very early time point in the reaction in order to understand the kinetics of the enzyme-catalyzed reaction.
The initial rate of enzyme activity provides information about how quickly the reaction proceeds at the beginning, when the substrate concentration is high and the product concentration is low. By determining the initial rate, researchers can gather data on the reaction's speed and efficiency, which can help them study the enzyme's properties, such as its catalytic efficiency and substrate specificity.
Additionally, the initial rate can be used to calculate the enzyme's turnover number (kcat), which is the number of substrate molecules converted into product per enzyme molecule per unit of time. Overall, determining the initial rate of enzyme activity at a very early time point is crucial for understanding the initial stages of the reaction and characterizing the enzyme's behavior.
learn more about enzyme-catalyzed reaction
https://brainly.com/question/30215655
#SPJ11
Which statement(s) is/are TRUE for all chemical reactions?
SELECT ALL THAT APPLY
a
Reactant elements and/or compounds rearrange to
form chemically new products.
b Energy is absorbed when bonds are broken.
There is an overall energy release during all
chemical reactions.
d Energy is released when bonds are formed.
Answers
Answer: The answers are A. Reactant elements and/or compounds rearrange to form chemically new products, B. Energy is absorbed when bonds are broken, and D. Energy is released when bonds are formed.
Explanation:
The statement that is true for all chemical reactions is "Reactant elements and/or compounds rearrange to form chemically new products."
A chemical reaction refers to any combination of reactants to yield products.
A chemical reaction involves rearrangement of bonds in reactant molecules in order to yield product molecules.
The rearrangement of chemical bonds in reactants to yield products is characteristic of all chemical reactions.
Learn more; https://brainly.com/question/1161517
Element Dy has 3 known isotopes. If.2% of the sample has a mass of 160
amu, .06% has a mass of 160.9 amu and the remaining has a mass 162
amu, what is the predicted mass of Dy?
Answers
Answer:
this girl in my class is getting a dog
Explanation:
but shes annoying so im hit her
What are the products of the following reactions?
1) cyclopentanone + cyclohexylamine
2) 3-pentanone + butylamine
3) 3-pentanone + cyclohexylamine
Answers
Imines are the nitrogen analogues of aldehydes and ketones, containing a C=N bond instead of a C=O bond.
They are formed through the addition of a primary amine to an aldehyde or ketone, kicking out a molecule of water (H2O) in the process.
In this post we show some examples of the synthesis of imines, walk through the mechanism for their formation, provide a few of their reactions and compare their properties to those of aldehydes and ketones.
A primary amine is added nucleophilically to the carbonyl group of an aldehyde or ketone to begin the reversible process of amine production. After that, a proton transfer creates a carbinolamine, a neutral amino alcohol. The carbinolamine oxygen is acid protonated to create a better leaving group, which is then removed as water to create an iminium ion. The ultimate imine product is produced when nitrogen is deprotonated.
To know more about imines click here:
https://brainly.com/question/22944136
#SPJ4
