DP Chemistry (last assessment 2024)

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Question 22M.1.hl.TZ2.26

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Date May 2022 Marks available [Maximum mark: 1] Reference code 22M.1.hl.TZ2.26
Level hl Paper 1 Time zone TZ2
Command term Estimate Question number 26 Adapted from N/A
26.
[Maximum mark: 1]
22M.1.hl.TZ2.26

A weak base is titrated with a strong acid. Which value of pKb can be estimated from this titration curve?

A.  11.3

B.  9.2

C.  4.8

D.  1.8

[1]

Markscheme

C

Examiners report

Only 29% of candidates determined pKb from the titration curve. The majority of the candidates made the mistake of using the pH without calculating the corresponding pOH.

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