DP Chemistry (last assessment 2024)

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Question 21N.2.hl.TZ0.11c

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Date November 2021 Marks available [Maximum mark: 3] Reference code 21N.2.hl.TZ0.11c
Level hl Paper 2 Time zone TZ0
Command term Label, Sketch Question number c Adapted from N/A
c.
[Maximum mark: 3]
21N.2.hl.TZ0.11c

50.00 cm3 of 0.75 mol dm−3 sodium hydroxide was added in 1.00 cm3 portions to 22.50 cm3 of 0.50 mol dm−3 chloroethanoic acid.

(c)

Sketch the neutralisation curve obtained and label the equivalence point.

[3]

Markscheme

OR

starts at 1.6 AND finishes at 13.6 ✔

approximately vertical at the correct volume of alkali added ✔

equivalence point labelled AND above pH 7 ✔

 

Accept any range from 1.1-1.9 AND 13.1-13.9 for M1 or ECF from 11c(i) and 11c(ii).

Award M2 for vertical climb at 28 cm3 OR 15 cm3.

Equivalence point must be labelled for M3.

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