DP Chemistry (first assessment 2025)

Test builder »

Question 21N.2.SL.TZ0.5a

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

a.

[Maximum mark: 1]

21N.2.SL.TZ0.5a

(a)

Formulate an equation for the reaction of one mole of phosphoric acid with one mole of sodium hydroxide.

[1]

Markscheme

H₃PO₄(aq) + NaOH (aq) → NaH₂PO₄(aq) + H₂O (l) ✔

Accept net ionic equation.

Syllabus sections

Reactivity 3. What are the mechanisms of chemical change? » Reactivity 3.1—Proton transfer reactions » Reactivity 3.1.7—Acids react with bases in neutralization reactions. Formulate equations for the reactions between acids and metal oxides, metal hydroxides, hydrogencarbonates and carbonates.

Tools » Tool 1: Experimental techniques

Tools » Tool 3: Mathematics