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Date May 2022 Marks available 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

Question

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

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.

Syllabus sections

Additional higher level (AHL) » Topic 18: Acids and bases » 18.3 pH curves
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Additional higher level (AHL) » Topic 18: Acids and bases
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