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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

Explain the trend in the enthalpy change of hydration of the halide ions.

anionic charge density decreases (down the group / $\mathrm{Cl}^{-}$ to $\mathrm{I}^{-}$ )

(so hydration enthalpies become less negative / less exothermic because)

less attraction of ion to water / the dipole-ion force weakens

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CAIE A-Level Chemistry A2 23.2.4 Explain in Qualitative Terms the Effect Topic Practice

Question 1