DP Chemistry (first assessment 2025)

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Question 21N.2.HL.TZ0.5d

Date	November 2021	Marks available	[Maximum mark: 1]	Reference code	21N.2.HL.TZ0.5d
Level	HL	Paper	2	Time zone	TZ0
Command term	Outline	Question number	d	Adapted from	N/A

d.

[Maximum mark: 1]

21N.2.HL.TZ0.5d

(d)

Outline the reasons that sodium hydroxide is considered a Brønsted–Lowry and Lewis base.

[1]

Markscheme

Brønsted–Lowry base:
proton acceptor

AND

Lewis Base:
e^– pair donor/nucleophile ✔

Syllabus sections

Reactivity 3. What are the mechanisms of chemical change? » Reactivity 3.4—Electron-pair sharing reactions » Reactivity 3.4.6—A Lewis acid is an electron-pair acceptor and a Lewis base is an electron-pair donor. Apply Lewis acid–base theory to inorganic and organic chemistry to identify the role of the reacting species.

Reactivity 3. What are the mechanisms of chemical change? » Reactivity 3.1—Proton transfer reactions » Reactivity 3.1.1—Brønsted–Lowry acid is a proton donor and a Brønsted–Lowry base is a proton acceptor. Deduce the Br.nsted–Lowry acid and base in a reaction.