DP Chemistry (last assessment 2024)

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Question 18N.2.hl.TZ0.b.i

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Date November 2018 Marks available [Maximum mark: 1] Reference code 18N.2.hl.TZ0.b.i
Level hl Paper 2 Time zone TZ0
Command term Calculate Question number b.i Adapted from N/A
b.i.
[Maximum mark: 1]
18N.2.hl.TZ0.b.i

Butanoic acid, CH3CH2CH2COOH, is a weak acid and ethylamine, CH3CH2NH2, is a weak base.

A 0.250 mol dm−3 aqueous solution of butanoic acid has a concentration of hydrogen ions, [H+], of 0.00192 mol dm−3. Calculate the concentration of hydroxide ions, [OH−], in the solution at 298 K.

[1]

Markscheme

« 1.00 × 10 − 14 mo l 2 d m − 6 0.00192 mol d m − 3 » = 5.21 × 10–12 «mol dm–3» ✔

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