DP Chemistry (last assessment 2024)

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Question 20N.2.sl.TZ0.1c(iii)

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Date November 2020 Marks available [Maximum mark: 1] Reference code 20N.2.sl.TZ0.1c(iii)
Level sl Paper 2 Time zone TZ0
Command term Calculate Question number c(iii) Adapted from N/A
c(iii).
[Maximum mark: 1]
20N.2.sl.TZ0.1c(iii)

Chlorine undergoes many reactions.

Chlorine gas reacts with water to produce hypochlorous acid and hydrochloric acid.

Cl2 (g)+H2O (l)⇌HClO (aq)+HCl (aq)

(c(iii))

Calculate the concentration of H+ (aq) in a HClO aq solution with a pH=3.61.

[1]

Markscheme

«[H+]=10−3.61=»2.5×10−4 «mol dm−3» ✔

Examiners report

A well answered question. It was pleasing to see that 70% of the candidates were able to calculate [H+] from the given pH.

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