The alkali metal hexachloroplatinates: Na2[PtCl6], K2[PtCl6], Rb2[PtCl6], Cs2[PtCl6] have the same type of lattice structure. How would you expect the solubility of these salts to vary (increase or decrease) from the sodium salt to the cesium salt? Explain your answer.
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Solubility is just another aspect of the lattice structure energy.
The higher the lattice energy, the less soluble the crystal will be. Since solvation is practicaly replacing the bonds between the crystal natives atoms with water sheath, breaking the bonds ...
The solution explains what are the parameters that affect the solubility of salts.