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General Chemistry

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Moderate

Thermodynamics of Ion Hydration

CHEM-1FOKSZ

$$Na^{+}(g) + Cl^{-}(g) +H_{2}O(aq) \rightarrow Na^+(aq) + Cl^-(aq)$$

When gas phase ions are hydrated, water molecules position themselves in predictable arrangements around the ions; for example, the sodium ion is thought to be surrounded by six water molecules.

We can conclude that for this process

A

$\Delta H<0$ and $\Delta S<0$.

B

$\Delta H<0$ and $\Delta S>0$.

C

$\Delta H>0$ and $\Delta S>0$.

D

$\Delta H>0$ and $\Delta S<0$.