A fixed-volume container initially shows 5 ions and 10 ions dispersed among many…

CHEMISTRY · Single correct · AP · Chemistry · Properties of Substances and Mixtures · Properties of Substances and Mixtures

Problem

A fixed-volume container initially shows 5

Ca^{2+}

ions and 10

Cl^{-}

ions dispersed among many water molecules. The solution is left to evaporate until the volume of water is reduced by half; no solute precipitates. Which change best describes how the particle diagram should be redrawn? (a) The numbers of

Ca^{2+}

and

Cl^{-}

ions double, while the number of water molecules stays the same. (b) Both the numbers of

Ca^{2+}

and

Cl^{-}

ions are halved, along with the water molecules, since some ions evaporate with the solvent. (c) The numbers of

Ca^{2+}

and

Cl^{-}

ions remain 5 and 10, respectively, but the ions appear twice as densely packed among fewer water molecules. (d) The number of

Cl^{-}

ions remains 10 while

Ca^{2+}

ions decrease to 3, altering the

Ca^{2+}:Cl^{-}

ratio.

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