4 g of a solute are dissolved in 40 g of water to form a saturated solution at `25^(@)C`. Calculate the solubility of the solute.

1.5 g of solute is dissolved in 15 g of water to form a saturated solution at 298K .Find out the solubility of the solute at the temperature .

5g of copper sulphate are dissolved in 100 g of water to form a saturated solution at 298 K .Find out the solubility of the solute at the temperature .

5 g of sodium chloride are dissolved 100 g of water to form a solution. Is this solution saturated in nature ?

4.0 g of NaOH are dissolved per litre of the solution at 298 K . Calculate the pH of the solution.