Account for the observation that solubility in water generally increases from chloride to iodide for ionic halides

Question:

Account for the observation that solubility in water generally increases from chloride to iodide for ionic halides with low covalent character (such as the potassium halides) but decreases from chloride to iodide for ionic halides in which the bonds are significantly covalent (such as the silver halides).

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