How many grams of will dissolve in distilled water to make one litre of saturated solution of it ? (Ksp for = 2.5 × 10–9mol2 lit–2)

Question

How many grams of $CaC_2O_4$ will dissolve in distilled water to make one litre of saturated solution of it ? (Ksp for $CaC_2O_4$ = 2.5 × 10–9mol2 lit–2)

Prashant Kotian · Accepted Answer

Correct answer: D. We know that, Solubility product sp K is- 2+ 2 sp 2 4 9 2 2 2 9 2 2 10 2 2 5 1 2 4 5 1 2 4 5 K Ca C O 2.5 10 mol L 2.5 10 mol L 25 10 mol L 5 10 mol L molar mass of CaC O 128.097g/mol mass of CaC O 128.097g/mol 5 10 mol L 640.4 10 0.0064g x x x x x x x x x x x x x 131. Solubility of an MX2 type electrolyte is 0.5 × 10–4 mole/lit, then Ksp of the electrolyte is (a) 5 × 10–12 (b) 25 × 10–10 (c) 1 × 10–13 (d) 5 × 10–13 The solubility product can be found as- 2+ - 2 2+ 2 sp 2 sp 3 sp MX M +2X K =[M ][X ] K =[x][2x] K =4x 3 4 sp

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