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CAIE A-Level Chemistry A2 25.1.4 H Aq and Ph Values Questions

Practise ranking pH values by acid strength, concentration and dissociation in aqueous solutions.

Syllabus
2028–2030
Course
Chemistry 9701
Level
A2

Exam points

  • relate lower pH to higher hydrogen-ion concentration and compare strong and weak acids at stated concentrations
  • account for complete or partial acid dissociation and the number of protons released when ranking pH values

CAIE A-Level Chemistry A2 25.1.4 H Aq and Ph Values Questions question 1

[Maximum number: 1]

The KaK_{a} of propanoic acid, CH3CH2COOH\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{COOH}, is 1.35×10−5moldm−31.35 \times 10^{-5} \mathrm{moldm}^{-3} at 298 K.

Solution C is a solution of CH3CH2COOH\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{COOH} with a pH of 3.60 at 298 K.

Calculate the concentration of a solution of hydrochloric acid with the same pH as solution C.

concentration=.............................. mol dm−3\text{concentration}=..............................\ \mathrm{mol\ dm}^{-3}
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