DP Chemistry (first assessment 2025)

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Question 23M.2.SL.TZ1.13a

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Date May 2023 Marks available [Maximum mark: 1] Reference code 23M.2.SL.TZ1.13a
Level SL Paper 2 Time zone TZ1
Command term Write Question number a Adapted from N/A
a.
[Maximum mark: 1]
23M.2.SL.TZ1.13a
(a)

Write two equations showing how these antacids neutralize excess hydrochloric acid.

 

Magnesium carbonate: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Aluminium hydroxide: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

 

 

[1]

Markscheme

MgCO3(s) + 2HCl(aq) → MgCl2(aq) + H2O(l) + CO2(g)
AND
Al(OH)3(s) +3HCl(aq) → AlCl3(aq) + 3H2O(l) ✓

 

Accept appropriate ionic equations.

Do not accept H2CO3 as a product of first reaction.

Ignore equilibrium arrows.