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Explain difference between ionic product and solubilities product . Explain the reaction with precipitation of sparingly soluble salt. |
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Answer» Solution :`K_(sp)` : At definitiontemperature the PRODUCE of concentration of ions of sparingly soluble salt in its saturated solution is called solubility product `K_(sp)` . e.g., `BaSO_(4(s)) hArr Ba_((aq))^(2+) + SO_(4(aq))^(2-)` `K_(sp)=[Ba_(aq)^(2+)][SO_((4))^(2-)]`....(Eq.-i) `Q_(sp)` : When two solutions of Sparingly soluble salts mix together than the product of concentration of ions of that two salts is called ionic product `Q_(sp)`. e.g. 0.1 M `Ba(NO_3)_2` mix with 0.05 M `H_2SO_4` in mixture : `Ba(NO_3)_2 to Ba^(2+) + 2NO_3^(-)` `H_2SO_4 to SO_4^(2-) + 2H^(+)` In this mixture the product of concentration of `Ba^(2+)` and `SO_4^(2-)` is called ionic product `Q_(sp) BaSO_4`. `Q_(sp)(BaSO_4)=[Ba^(2+)][SO_4^(2-)]`....(Eq.-ii) Reaction between `K_(sp)` and `Q_(sp)` : If `Q_(sp)=K_(sp)` EQUILIBRIUM is established. If `Q_(sp) lt K_(sp)` precipitation not take place If `Q_(sp) gt K_(sp)` precipitation will take place. By COMPARING the value of `Q_(sp)` and `K_(sp)` precipitation will take place or not can be predicted . |
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