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Question

Sometimes, Ionic product and solubility product are the same - true or false?


A

True

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B

False

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Solution

The correct option is A

True


If we try to dissolve a sparingly soluble salt (like Al(OH)3, AgCl, etc.) in water, only a very small amount of it is dissolved in reality. At some point, a dynamic chemical equilibrium is established between the solvated ions and the insoluble solid.

XY (s) X+ (aq) + Y (aq)

You know the drill. Derive Keq

But here the concentration of the solid is ? Yes. It is always unity. Concentrations of pure solids never change with time.

The general product of [X+][Y] is called the ionic product. At equilibrium, when the undissolved solid is in a dynamic equilibrium (for a particular temperature), ionic product = solubility product. Rather, the ionic product of a saturated sparingly soluble salt in its solution is called the solubility product.

At equilibrium Solubility product = ionic product

Ksp = [X+][Y ] If not in equilibrium, ionic product may be greater than or lesser than the solubility product!


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