(a) Two students Ramesh and Alka were required to prepare 10 percent (mass/mass) solution chloride in water. For that, Ramesh dissolved 10 g of the salt in 100g of water while Alka dissolved 10g of the salt in water to make 100g of the solution. Which out of the two prepared the correct solution ?
(b) You are given a solution of a substance 'A'. How will you test whether it is saturated or unsaturated with respect to 'A' at a given temperature ?

Explanation

(a) Alka prepared the correct solution because by definition 10 percent solution of a substance means a solution containing 10g of the solute dissolved in 100g of it. This means that the mass of water in the solution is 90 g.
(b) Take the given solution in a beaker. Now add small amount of 'A' to this solution and stir with a glass rod. If it dissolves in this solution, this means that the solution is unsaturated. If it does not dissolve and separates as a solid at the bottom of the beaker, the solution is saturated in nature.