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Potassium iodide, KI, is used as a reagent in both inorganic and organic chemistry.

Table 1.1 gives some data about the halide ions, $\mathrm{Cl}^{-}, \mathrm{Br}^{-}$ and $\mathrm{I}^{-}$ , and their potassium salts.

Table 1.1

The $\Delta H_{\text {sol }}$ values of these potassium halides are almost constant.

Use the $\Delta H_{\text {hyd }}$ and $\Delta H_{\text {latt }}$ data in Table 1.1 to suggest why.

the difference between $\Delta H_{\text {latt }}$ and $\Delta H_{\text {hyd }}$ remains roughly constant

OR $\Delta H_{\text {latt }}$ and $\Delta H_{\text {hyd }}$ become less exothermic by a similar amount

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CAIE A-Level Chemistry A2 23.2.2 An Energy Cycle Involving Enthalpy Change Topic Practice

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