DP Chemistry (first assessment 2025)

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Question 19N.2.SL.TZ0.a(i)

Date	November 2019	Marks available	[Maximum mark: 1]	Reference code	19N.2.SL.TZ0.a(i)
Level	SL	Paper	2	Time zone	TZ0
Command term	Apply, Identify	Question number	a(i)	Adapted from	N/A

a(i).

[Maximum mark: 1]

19N.2.SL.TZ0.a(i)

Identify a conjugate acid–base pair in the equation.

[1]

Markscheme

C₆H₈O₇ AND C₆H₇O₇⁻
OR
H₂O AND H₃O⁺ ✔

Syllabus sections

Reactivity 3. What are the mechanisms of chemical change? » Reactivity 3.1—Proton transfer reactions » Reactivity 3.1.2—A pair of species differing by a single proton is called a conjugate acid–base pair. Deduce the formula of the conjugate acid or base of any Br.nsted–Lowry base or acid.