Date | November 2021 | Marks available | 1 | Reference code | 21N.1.hl.TZ0.25 |
Level | HL | Paper | 1 | Time zone | TZ0 |
Command term | Solve | Question number | 25 | Adapted from | N/A |
Question
What is the pH of 0.01 mol dm−3 KOH (aq)?
A. 1.0
B. 2.0
C. 12.0
D. 13.0
Markscheme
C
Examiners report
Syllabus sections
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22M.2.hl.TZ1.4c(i):
Calculate the concentration of hydroxide ions in an ammonia solution with pH = 9.3. Use sections 1 and 2 of the data booklet.
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17N.1.sl.TZ0.20:
Which statement is incorrect for a 0.10 mol dm–3 HCOOH solution?
A. pH = 1
B. [H+] << 0.10 mol dm–3
C. [HCOO–] is approximately equal to [H+]
D. HCOOH is partially ionized
- 16N.2.sl.TZ0.2b: Suggest why it is more convenient to express acidity using the pH scale instead of using the...
- 17N.1.sl.TZ0.19: 10.0 cm3 of an aqueous solution of sodium hydroxide of pH = 10 is mixed with 990.0 cm3 of...
- 22M.1.sl.TZ1.20: Which 0.01 mol dm–3 aqueous solution has the highest pH? A. HCl B. H2SO4 C. NaOH D. NH3
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19M.1.hl.TZ1.24:
Which solution is basic at 25 °C?
Kw = 1.0 × 10−14
A. [H+] = 1.0 × 10−3 mol dm−3
B. [OH−] = 1.0 × 10−13 mol dm−3
C. solution of pH = 4.00
D. [H3O+] = 1.0 × 10−13 mol dm−3
- 18M.1.hl.TZ1.25: What is the pH of a solution in which the hydroxide ion concentration is 1 × 10−11 mol dm−3...
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17M.1.hl.TZ1.25:
What is the pH of 1.0 × 10−3 mol dm−3 sodium hydroxide, NaOH(aq)?
Kw = 1.0 × 10−14
A. 3
B. 4
C. 10
D. 11
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17N.1.sl.TZ0.18:
What will happen if the pressure is increased in the following reaction mixture at equilibrium?
CO2 (g) + H2O (l) H+ (aq) + HCO3− (aq)
A. The equilibrium will shift to the right and pH will decrease.
B. The equilibrium will shift to the right and pH will increase.
C. The equilibrium will shift to the left and pH will increase.
D. The equilibrium will shift to the left and pH will decrease.
- 21N.1.hl.TZ0.27: What is correct for pure hot water?
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19N.3.sl.TZ0.16d:
Calculate the pH of a buffer solution which contains 0.20 mol dm−3 ethanoic acid and 0.50 mol dm−3 sodium ethanoate. Use section 1 of the data booklet.
pKa (ethanoic acid) = 4.76
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19M.1.sl.TZ2.19:
What is the pH of 0.001 mol dm−3 NaOH (aq)?
A. 1
B. 3
C. 11
D. 13
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19M.1.hl.TZ2.24:
What is the pH of 0.001 mol dm−3 NaOH (aq)?
A. 1
B. 3
C. 11
D. 13
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19M.1.sl.TZ1.19:
Which solution is basic at 25 °C?
Kw = 1.0 × 10−14
A. [H+] = 1.0 × 10−3 mol dm−3
B. [OH−] = 1.0 × 10−13 mol dm−3
C. solution of pH = 4.00
D. [H3O+] = 1.0 × 10−13 mol dm−3
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17M.2.sl.TZ2.7b.iii:
Calculate [H+] in the NaOH solution.
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19M.2.sl.TZ2.5b(i):
Predict, referring to Equilibrium (2), how the added sodium hydrogencarbonate affects the pH.(Assume pressure and temperature remain constant.)
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19N.3.sl.TZ0.8b:
Explain why a change in pH affects the tertiary structure of an enzyme in solution.
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18N.2.hl.TZ0.6b.i:
A 0.250 mol dm−3 aqueous solution of butanoic acid has a concentration of hydrogen ions, [H+], of 0.00192 mol dm−3. Calculate the concentration of hydroxide ions, [OH−], in the solution at 298 K.
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18M.2.sl.TZ2.2c:
Outline why pH is more widely used than [H+] for measuring relative acidity.
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20N.2.hl.TZ0.1c(iii):
Calculate the concentration of in a solution with a .
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21M.2.hl.TZ2.1c(iii):
Saturated calcium hydroxide solution is used to test for carbon dioxide. Calculate the pH of a 2.33 × 10−2 mol dm−3 solution of calcium hydroxide, a strong base.
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19M.2.hl.TZ2.5d(ii):
Predict, referring to Equilibrium (2), how the added sodium hydrogencarbonate affects the pH.(Assume pressure and temperature remain constant.)
- 21M.2.sl.TZ1.2b(iii): Calculate the hydroxide ion concentration in saturated aqueous hydrogen sulfide.
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21M.2.sl.TZ2.1d(iii):
Saturated calcium hydroxide solution is used to test for carbon dioxide. Calculate the pH of a 2.33 × 10−2 mol dm−3 solution of calcium hydroxide, a strong base.
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20N.2.sl.TZ0.1c(iii):
Calculate the concentration of in a solution with a .
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20N.1.sl.TZ0.16:
Which apparatus can be used to monitor the rate of this reaction?
- A pH meter
- A gas syringe
- A colorimeter
A. I and II only
B. I and III only
C. II and III only
D. I, II and III
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19M.2.hl.TZ1.2f(i):
The pH of an aqueous solution of benzoic acid at 298 K is 2.95. Determine the concentration of hydroxide ions in the solution, using section 2 of the data booklet.
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20N.1.hl.TZ0.27:
What is the pH of an ammonia solution that has ?
A.
B.
C.
D.
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21M.1.sl.TZ1.20:
Which solution has a pH of 9?
A. 1.0 × 10−9 mol dm−3 (aq)
B. 1.0 × 10−5 mol dm−3 (aq)
C. 1.0 × 10−9 mol dm−3 (aq)
D. 1.0 × 10−5 mol dm−3 (aq)
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19M.2.sl.TZ1.2b(i):
The pH of an aqueous solution of benzoic acid at 298 K is 2.95. Determine the concentration of hydroxide ions in the solution, using section 2 of the data booklet.
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22M.2.sl.TZ1.2e(iii):
Calculate the concentration of hydroxide ions in an ammonia solution with pH = 9.3. Use sections 1 and 2 of the data booklet.
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22M.1.sl.TZ2.19:
Which of the 0.001 mol dm−3 solutions is most likely to have a pH of 11.3?
A. Ca(OH)2 (aq)
B. H3PO4 (aq)
C. NaOH (aq)
D. NH4OH (aq)