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Solubility of a solid in a liquid depends on:
a) Nature of solvent and soluteb) Temperature.
Nature of solvent and solute
Polar solvent dissolves polar solutes and nonpolar solvents dissolve nonpolar solutes. For e.g., polar solvents like water, liquid ammonia, liquid hydrofluoric acid etc. dissolve polar and ionic compounds. Whereas nonpolar solvents like benzene, carbon disulphide, carbontetrachloride etc. dissolve nonpolar compounds.
Temperature
The substance, which dissolve in a solvent with absorption of heat (e.g., NH4Cl, KNO3, NaNO3 etc.) show an increase in solubility with increase in temperature, whereas the solubility of substances which dissolve with evolution of heat (e.g. NaOH, (CH3COO)2Ca etc.,) show a decrease in their solubility with rise in temperature.

