Question

The following pictures represent solutions of CaCO3, which may also contain ions other than Ca2+ and CO32- which are not shown. Gray spheres represent Ca2+ ions and unshaded spheres represent CO32- ions.

If solution (1) is a saturated solution of CaCO3, which of solutions (1)-(4) represents the solution after a small amount of NaOH is added and equilibrium is restored?
A) (1)
B) (2)
C) (3)
D) (4)

Answer

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