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Potassium chloride, KCl , and magnesium chloride, $\mathrm{MgCl}_{2}$ , are both ionic solids.

Table 1.1

Potassium chloride is very soluble in water at $20^{\circ} \mathrm{C}$ .

Explain the solubility of potassium chloride by reference to change in entropy, $\Delta S$ .

$\Delta \mathrm{S}$ is positive
$\text { AND } \mathrm{KCl}(\mathrm{~s}) \rightarrow \mathrm{K}^{+}(\mathrm{aq})+\mathrm{Cl}^{-}(\mathrm{aq}) /$

ionic lattice solid forms aqueous ions OWTTE [1]

OR

$\Delta \mathrm{S}$ is positive

AND $\Delta \mathrm{G}$ is (therefore becomes) negative /

$\mathrm{T} \Delta \mathrm{S}$ is greater than $\Delta H_{\mathrm{sol}}$ OWTTE [1]

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CAIE A-Level Chemistry A2 23.3.2 Predict Explain the Sign of the Entropy Topic Practice

Question 1