A-LevelChemistryEquilibria9701/12 · Oct/Nov 2024 · Q131 Mark

When some solid Ca5(PO4)3OH is added to a beaker of water, an equilibrium is set up. Ca5(PO4)3OH(s) ⇌ 5Ca²⁺(aq) + 3PO4³⁻(aq) + OH⁻(aq) Which compound, when added to the equilibrium mixture, increases the amount of Ca5(PO4)3OH(s) present?

ANH3

BNH4Cl

CCH3CO2H

DNaCl

✓ Correct answer

A: NH3

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Topic: Equilibria, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Oct/Nov 2024 Paper 1 Variant 2, question 13.

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