1.

How many grams of CaC2O4 will dissolve in distilled water to make one litre of saturated solution (Ksp = 6.25 × 10–10 and its molecular mass is 128) : (A) 0.0064 g (B) 0.0128 g (C) 0.0032 g (D) 0.0640 g 

Answer»

Correct option: (C) 0.0032 g

Explanation: 

[Ca2+] [C2O42–] = 6.25 × 10–10 so solubility = 2.5 × 10–5 mol/L = 2.5 × 128 × 10–5 = 3.2 × 10–3 g/L



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