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AP® Chemistry

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Moderate

Adding a Substance

APCHEM-8JWVVL

Consider the solubility equilibrium system represented by the following reaction:

$$PbCO_{3(s)} ⇄ Pb^{2+} \ _{(aq)} + CO_3 \ ^{2-} \ _{(aq)}$$

Which of the following describes what occurs when solid sodium carbonate is added to the lead(II) carbonate solution at constant temperature?

A

The concentration of the lead ion decreases as the amount of solid increases.

B

The system remains unchanged since sodium carbonate is not part of the equilibrium equation.

C

The concentration of the lead ion increases as the amount of solid decreases.

D

The concentration of the lead ion increases as the amount of solid increases.