Which of the following statements is correct?
As temperature increases, the pH value of pure water decreases
As temperature decreases, the pH value of pure water decreases
The pH of water is unaffected by temperature
Pure water is not neutral
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What is the correct comparison of hydrogen ions between a solution of pH 2 and a solution of pH 4?
Twice as large
Half as much
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The pH of a sample of acid rain at 25 C is 4.55.
What is the [OH-] in the sample?
9.45 M
3.55 x 10-10 M
2.82 x 10-5 M
1.0 x 10-14 M
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What is the pH of a solution of NaOH of concentration 0.001 M?
1
3
11
13
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Two flasks contain two different acids labelled as HA and HB. A student measures the pH of each flask, and finds that they are pH 1 and pH 3 respectively.
Which of the following statements is true?
HA is a stronger acid than HB
HB is a stronger acid than HA
The [H3O+] in the solution of HB is 3 times greater than the [H3O+] in the solution of HA.
The [H3O+] in the solution of HA is 100 times greater than the [H3O+] in the solution of HB.
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When 300 mL of 1.5 M KOH (aq) is added to 400 mL of 0.8 M HBr (aq), the pH of the resulting mixture is closest to
1.8
4.5
7.0
13.3
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Acid | Concentration (M) | pH |
|---|---|---|
X | 0.010 | 2.1 |
Y | 1.5 | 3.0 |
Z | 2.5 | 3.5 |
Which of the following correctly ranks the three monoprotic acids listed in the table above from the strongest to the weakest?
X > Y > Z
X > Z > Y
Y > X > Z
Z > Y > X
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The Kb value for a base is 8.0 x 10-4 at 298 K.
What is the pKa value for the conjugate acid at this temperature?
10
1.3 x 10-11
3.1
10.9
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