7.72 What is the minimum volume of water required to dissolve 1g of calcium sulphate at 298 K? (For calcium sulphate, Ksp is 9.1 × 10-6)
We have,
The solubility product of calcium sulphate is .
given mass of calcium sulphate = 1g
Ionization of calcium sulphate;
Therefore,
Let the solubility of calcium sulphate be .
Then,
mol/L
Thus,
mass/ (mol. wt) volume Molarity
mass =
So, that to dissolve 1 g of calcium sulphate we need = of water.