DP Chemistry (last assessment 2024)

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Question 22N.2.hl.TZ0.1c.i

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Date November 2022 Marks available [Maximum mark: 1] Reference code 22N.2.hl.TZ0.1c.i
Level hl Paper 2 Time zone TZ0
Command term Calculate Question number c.i Adapted from N/A
c.i.
[Maximum mark: 1]
22N.2.hl.TZ0.1c.i

Ammonium nitrate, NH4NO3, is used as a high nitrogen fertilizer.

A 0.20 mol dm−3 solution of ammonium nitrate is prepared.

(c.i)

Calculate the pH of an ammonium nitrate solution with [H3O+] = 1.07 × 10−5 mol dm−3. Use section 1 of the data booklet.

[1]

Markscheme

«pH = –log (1.07 × 10−5) =» 4.97 ✔

Examiners report

Almost all students managed to use their calculators to work out that −log (1.07 × 10−6) is 4.97, though a few lost the mark by then rounding down to 4.9.

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