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Potential Equilibrium System

APCHEM-GBRCEX

Which of the following does NOT represent a potential equilibrium system?

A

Ammonium carbonate, ${ \left( { NH }_{ 4 } \right) }_{ 2 }C{ O }_{ 3 }$, decomposes spontaneously when exposed to the air.

B

Solutions of silver nitrate, $AgN{ O }_{ 3 }(aq)$, and sodium chloride, $NaCl(aq)$, are mixed.

C

Glacial (100%) acetic acid, $C{ H }_{ 3 }COOH(l)$, is stirred slowly into a beaker of distilled water.

D

You have a sealed container, half-filled with water.