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Write notes on (i) Common ion effect ...

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(i) Common ion effect
(ii) The relation between `K_(sp)` and solubility (S) of a sparingly soluble salt `BaSO_(4)`.

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Relation between `K_(sp) and .S.` of salt `BaSO_(4)`
`BaSO_(4) hArr underset(S)(Ba^(+2))+ underset(S)(SO_(4)^(-2))`
`K_(SP)=S xxS`
`K_(SP)=S^(2)`
`S= sqrt(K_(SP))`
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A solution which remains in equilibrium with undissolved solute is said to be saturated. The concentration of a saturated solution at a given temperature is called solubility. The product of concentration of ions in a saturated solution of an electrolyte at a given temperature, is called solubility product (K_(sp)) . For the electrolyte, A_(x),B_(y),:A_(x),B_(y(s)) rarr xA^(y+)+ y^(Bx-) , with solubility S, the solubility product (K_(sp)) =x^(x)xxy^(y) xx s^(x+y) . While calculating the solubility of a sparingly soluble salt in the presence of some strong electrolyte containing a common ion, the common ion concentration is practically equal to that of strong electrolyte. If in a solution, the ionic product of an clectrolyte exceeds its K_(sp) , value at a particular temperature, then precipitation occurs. The solubility of BaSO_(4) , in 0.1 M BaCl_(2) , solution is (K_(sp) , of BaSO_(4), = 1.5 xx 10^(-9))

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