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To answer your question it is important to know which compound dissociate completely in water when in aqueous solution. For example, consider following reaction: $$\ce{AgNO3_{(aq)} + NaCl_{(aq)} -> AgCl_{(s)} + NaNO3_{(aq)}} \tag1$$ When ionic compound dissolves in water, each molecule separates to corresponding ions, which influenced by water. All of $\... 2 In addition to Mithoron's and Poutnik's comments, the solubility product may not be relevant to your solution chemistry anyway. Solubility products enter into solution equilibria when the precipitates are present, as in this answer where relative solubility products predict whether mostly magnesium or mostly iron will be dissolved in water when their ... 1 The electronegativity is not the main factor. The entropy factor is much more important. When a salt like$\ce{BaSO_4}$tries to get dissolved, its ions are attracting water molecules that get fixed or attached around each ion. This phenomena creates order, and decreases the entropy of the solution. The same thing happens around sulfate ions$\ce{SO_4^{2-}}\$...