DP Chemistry (first assessment 2025)

Test builder »

Question 21M.1A.HL.TZ2.27

Date	May 2021	Marks available	[Maximum mark: 1]	Reference code	21M.1A.HL.TZ2.27
Level	HL	Paper	1A	Time zone	TZ2
Command term	Determine	Question number	27	Adapted from	N/A

27.

[Maximum mark: 1]

21M.1A.HL.TZ2.27

Which compound is acidic in aqueous solution?

A. KBr

B. CH₃COONa

C. NH₄Cl

D. Na₂CO₃

[1]

Markscheme

C

Syllabus sections

Reactivity 3. What are the mechanisms of chemical change? » Reactivity 3.1—Proton transfer reactions » Reactivity 3.1.12—The pH of a salt solution depends on the relative strengths of the parent acid and base. Construct equations for the hydrolysis of ions in a salt, and predict the effect of each ion on the pH of the salt solution.