DP Chemistry (last assessment 2024)

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Question 17N.2.hl.TZ0.6c.ii

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Date November 2017 Marks available [Maximum mark: 1] Reference code 17N.2.hl.TZ0.6c.ii
Level hl Paper 2 Time zone TZ0
Command term Calculate Question number c.ii Adapted from N/A
c.ii.
[Maximum mark: 1]
17N.2.hl.TZ0.6c.ii

The pH of 0.010 mol dm–3 carbonic acid, H2CO3 (aq), is 4.17 at 25 °C.

H2CO3 (aq) + H2O (l) ⇌ HCO3– (aq) + H3O+ (aq).

(c.ii)

Calculate Kb for HCO3– acting as a base.

[1]

Markscheme

« 1.00 × 10 − 14 4.6 × 10 − 7 =» 2.17 x 10–8

OR

« 1.00 × 10 − 14 4.57 × 10 − 7 =» 2.19 x 10–8

Syllabus sections