Chemistry 9701 · AS & A Level · Equilibria

Equilibria — practice question

When a small quantity of solid $\text{Ca}_5(\text{PO}_4)_3\text{OH}$ is put into a beaker of water, an equilibrium is established. $\text{Ca}_5(\text{PO}_4)_3\text{OH}(s) \rightleftharpoons 5\text{Ca}^{2+}(aq) + 3\text{PO}_4^{3-}(aq) + \text{OH}^-(aq)$. Which compound, if added to this equilibrium mixture, causes the quantity of $\text{Ca}_5(\text{PO}_4)_3\text{OH}(s)$ present to increase?

  • A$\text{NH}_3$
  • B$\text{NH}_4\text{Cl}$
  • C$\text{CH}_3\text{CO}_2\text{H}$
  • D$\text{NaCl}$

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