MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryIonic equilibriumPreferential precipitation of salts
At 18ºC, the solubility product of AgCl is 1.8 × 10–10. In the solution, the value of [Ag⁺] is 4 × 10–3mol/litre. The value of [Cl–] to precipitate AgCl from this solution should be greater than
A.4.5 × 10–8mol/litre✓ Correct
B.7.2 × 10–12mol/litre
C.4.0 × 10–3mol/litre
D.4.5 × 10–7mol/litre
Explanation
We know that, solubility product of AgCl can be calculated as- The solubility can be found as- Let concentration of A and B ions will be- x sp 10 3 10 3 7 8 AgCl Ag Cl K [Ag ][Cl ] 1.8 10 [4 10 ][ ] [ ] 1.8 10 / 4 10 0.45 10 4.5 10 x x x x x x x x M M If the ionic product exceeds this value, then precipitation takes place. Acid base Titration
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