DP Chemistry (last assessment 2024)

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Question 19M.2.sl.TZ1.c

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.2.sl.TZ1.c
Level sl Paper 2 Time zone TZ1
Command term Comment Question number c Adapted from N/A
c.
[Maximum mark: 1]
19M.2.sl.TZ1.c

This question is about peroxides.

Comment on why peracetic acid, CH3COOOH, is always sold in solution with ethanoic acid and hydrogen peroxide.

H2O2 (aq) + CH3COOH (aq) ⇌ CH3COOOH (aq) + H2O (l)

[1]

Markscheme

move «position of» equilibrium to right/products  [✔]

 

Note: Accept “reactants are always present as the reaction is in equilibrium”.

Examiners report

Suggesting why peractic acid was sold in solution was very poorly answered and only a few students mentioned equilibrium and, if they did, they thought it would move to the left to restore equilibrium.

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