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CAIE A-Level Chemistry AS 7.2.4 Strong Acids and Strong Bases As Fully Questions

Practise explaining complete ionisation of strong acids and strong bases in aqueous solution using CAIE 9701 AS questions and mark schemes.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • Explain that strong acids and strong bases are fully ionised in aqueous solution.

CAIE A-Level Chemistry AS 7.2.4 Strong Acids and Strong Bases As Fully Questions question 1

[Maximum number: 1]

Four solutions, each of concentration 0.1 moldm−30.1 \mathrm{~mol} \mathrm{dm}^{-3}, were tested with a pH meter. The results are shown.

solution

formula of acid or base

pH

acid 1

CH3CO2H\mathrm{CH}_{3} \mathrm{CO}_{2} \mathrm{H}

4

acid 2

HNO3\mathrm{HNO}_{3}

1

base 1

CH3NH2\mathrm{CH}_{3} \mathrm{NH}_{2}

11

base 2

NaOH

14

Which statements explain these results?
1 Acid 2 has a lower pH than acid 1 because it is more soluble.
2 Base 2 has a higher concentration of hydroxide ions in solution than base 1.
3 Acid 1 dissociates less than acid 2.

A

1, 2 and 3 are correct

B

1 and 2 only are correct

C

2 and 3 only are correct

D

1 only is correct

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