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- 1. Multiple Choice
Which one of the following is the change in units of pH which occurs when 10.0 cm3 of a 1.0 M solution of a strong monoprotic acid are made up to 1.0 dm3 with water?
1
2
3
5
- 2. Multiple Choice
Addition of which one of the following to 10 cm3 of 1.0 M NaOH would result in the pH being halved?
10 cm3 of water
100 cm3 of water
5 cm3 of 1.0 M HCl
10 cm3 of 1.0 M HCl
- 3. Multiple Choice
The pH of 0.001 M NaOH at 25°C is
13
11
9
3
- 4. Multiple Choice
An aqueous solution contains 4.0 g of sodium hydroxide in 250 cm3 of solution. (Kw = 1.00 × 10−14 mol2 dm−6) The pH of the solution is
13.0
13.3
13.6
13.9
- 5. Multiple Choice
Which one of the following could be true in an aqueous solution of sodium hydroxide?
[H+] = (OH−]
pH = −log10 [OH−]
pH = 1.2
pH = 12.8
- 6. Multiple Choice
A solution of sodium ethanoate has a pH of 8.91 at 25 °C. The hydrogen ion and hydroxide ion concentrations in this solution are ...
[H+] = 1.00 × 10−9 mol dm−3 [OH−] = 1.00 × 10−5 mol dm−3
[H+] = 1.00 × 10−9 mol dm−3 [OH−] = 8.13 × 10−6 mol dm−3
[H+] = 1.23 × 10−9 mol dm−3 [OH−] = 1.00 × 10−5 mol dm−3
[H+] = 1.23 × 10−9 mol dm−3 [OH−] = 8.13 × 10−6 mol dm−3
- 7. Multiple Choice
A weak acid HA dissociates in aqueous solution as shown below
HA(aq) ⇌ H+(aq) + A−(aq) ∆H = +20 kJ mol−1
Which one of the following changes will result in a decrease in the pH of an aqueous solution of the acid?
addition of a little aqueous sodium hydroxide solution
raising the temperature of the solution
dissolving a little of the sodium salt, NaA, in the solution
adding a platinum catalyst to the solution
- 8. Multiple Choice
What is the pH of a 0.46 mol dm−3 solution of potassium hydroxide at 298 K?
(Kw = 1.0 × 10−14 mol2 dm−6 at 298 K)
0.34
13.66
13.96
14.34
- 9. Multiple Choice
What is the pH of a 0.020 mol dm–3 solution of a diprotic acid which is completely dissociated?
1.00
1.40
1.70
4.00
- 10. Multiple Choice
The acid dissociation constant, Ka, of a weak acid HA has the value 2.56 × 10–4 mol dm–3.
What is the pH of a 4.25 × 10–3 mol dm−3 solution of HA?
5.96
3.59
2.98
2.37
- 11. Multiple Choice
2,4,6-Trichlorophenol is a weak monoprotic acid, with Ka = 2.51 × 10−8 mol dm−3 at 298 K.
What is the concentration, in mol dm−3, of hydrogen ions in a 2.00 × 10−3 mol dm−3 solution of 2,4,6-trichlorophenol at 298 K?
5.02 × 10−11
7.09 × 10−6
1.26 × 10−5
3.54 × 10−3
- 12. Multiple Choice
Use the information below to answer this question.
A saturated solution of magnesium hydroxide, Mg(OH)2, contains 0.1166 g of Mg(OH)2 in 10.00 dm3 of solution. In this solution the magnesium hydroxide is fully dissociated into ions.
Which one of the following is the pH of a solution of magnesium hydroxide containing 4.0 × 10−5 mol dm−3 of hydroxide ions at 298 K?
(Kw = 1.0 × 10−14 mol2 dm−6 at 298 K)
9.6
9.5
8.6
8.3
- 13. Multiple Choice
This question is about the following reaction scheme which shows the preparation of polymer P.
K is a weak acid with a pKa of 9.95. The pH of a 0.10 mol dm−3 solution of K is
4.48
4.98
5.48
5.98
- 14. Multiple Choice
Which indicator should be used in a titration to find the concentration of a solution of methylamine using 0.010 mol dm–3 hydrochloric acid?
Thymol blue (pH range 1.2–2.8)
Bromophenol blue (pH range 3.0–4.6)
Phenol red (pH range 6.8–8.4)
Phenolphthalein (pH range 8.3–10.0)
- 15. Multiple Choice
The table shows the pKa values for two acids. Which statement is correct?
Propanoic acid is a stronger acid than butanoic acid.
The value of Ka for propanoic acid is greater than that for butanoic acid.
The value of Ka for propanoic acid is 1.35 × 10−5 mol dm−3
The value of Ka for butanoic acid is 6.61 × 104 mol dm−3
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