AnswersChemistry A.1 - F26 - Jacob MetskerLab: Calorimetry and Specific Heat

pH Answers

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1
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The pH of a solution decreases by 2.0. How does the hydronium ion concentration of the solution change?

A
increases to 2 times the original concentration
B
increases to 100 times the original concentration
C
decreases to of the original concentration
Option C
D
decreases to of the original concentration
Option D
2
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Which describes an alkaline solution?

A
pH less than 7
B
pH equal to 7
C
basic
D
acidic
3

Note the pH and pOH values labeled with letters on the pH scale below.Based on log rules and the way pH is calculated, what is the difference in [OH– ] concentration between point A and point B.

Question illustration
A
101
B
105
C
106
D
107
4

What is the equilibrium constant of pure water at 25°C?

A
1014
B
10–14
C
10–7
D
107
5

What is the pH of a solution with [H+] = 1.25 10–10 M?Use .

Question illustration
A
–10.1
B
–9.90
C
7.90
D
9.90
6

Which statement about the self-ionization of water is correct?

A
Two water molecules interact to form a water molecule and a hydroxide ion.
B
Two water molecules interact to form a hydronium ion and a hydroxide ion.
C
Two water molecules interact to form two hydronium ions.
D
Two water molecules interact to form two hydroxide ions.
7

Which statement best describes the pH of pure water?

A
It is neutral because the concentration of hydronium ions equals that of hydroxide ions.
B
It is neutral because the pure liquid contains neither hydronium ions nor hydroxide ions.
C
It is acidic because it has a hydronium ion concentration of .
Option C
D
It is basic because it has a hydroxide ion concentration of .
Option D
8

The pH of a solution is 2.0. Which statement is correct?Useful formulas include , , , and .

Question illustration
A
The pOH of the solution is 12.0.
B
The concentration of OH– ions is 1.0 10–2 M.
Option B
C
The concentration of ions is 100.0 M.
Option C
D
The pOH of the solution is 16.0.
9

How can the pH of a solution be calculated if the pOH is known?

A
by taking the negative logarithm of pOH
B
by adding the pOH to 14
C
by raising 10 to the power of –pOH
D
by subtracting the pOH from 14
10

Which describes an alkaline solution?

A
pH less than 7
B
pH equal to 7
C
basic
D
acidic
11

A substance with a high [H+ ] would likely have which additional characteristics?

A
a high [OH– ] and a high pOH
B
a low [OH– ] and a high pOH
C
a high [OH– ] and a low pOH
D
a low [OH– ] and a low pOH
12

Based on the definition of logarithms, what is the difference in hydrogen ion concentration between a substance with a pH of 2 and a substance with a pH of 3?

A
A substance with a pH of 2 has a 10 times higher concentration of H+ than a substance with a pH of 3.
B
A substance with a pH of 3 has a 10 times higher concentration of H+ than a substance with a pH of 2.
C
A substance with a pH of 2 has a 100 times higher concentration of H+ ions than a substance with a pH of 3.
D
A substance with a pH of 3 has a 100 times higher concentration of H+ ions than a substance with a pH of 2.
13

A solution containing HCl would likely have

A
a high pH and a low pOH.
B
a low pH and a high pOH.
C
a high pH and a high pOH.
D
a low pH and a low pOH.
14

The pH of a solution is 2.0. Which statement is correct?Useful formulas include , , , and .

Question illustration
A
The pOH of the solution is 12.0.
B
The concentration of OH– ions is 1.0 10–2 M.
Option B
C
The concentration of ions is 100.0 M.
Option C
D
The pOH of the solution is 16.0.
15

The pOH of a solution is 10.75. What is the concentration of OH– ions in the solution?Use .

Question illustration
A
3.162 10–108 M
Option A
B
1.778 10–11 M
Option B
C
1.075 102 M
Option C
D
5.623 1010 M
Option D

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