DP Chemistry (last assessment 2024)

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Question 19M.2.hl.TZ1.4c

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.2.hl.TZ1.4c
Level hl Paper 2 Time zone TZ1
Command term Comment Question number c Adapted from N/A
c.
[Maximum mark: 1]
19M.2.hl.TZ1.4c

This question is about the decomposition of hydrogen peroxide.

(c)

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

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

 

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

Examiners report

One teacher suggested that “stored” would have been better than “sold” for this question. There were a lot of irrelevant answers with many believing the back reaction was an acid dissociation.

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