Question

A solution of solute 'X' contains 30% X by weight of solution. 500 g of this solution was cooled when 50 g of solute gets precipitated. The % age composition of the remaining solution is ?

• A. 11.1%
• B. 22.2%
• C. 33.3%
• D. 50%

Answer 1

The correct option is B

22.2%

Weight of solute present in 500g of solution $=\frac{30\times 500}{100}=150g$
Weight of solvent in 500g of solution
= [500 - 150g] = 350g
Weight of solute left after cooling
= (150 - 50g) = 100g
Total weight of solution after cooling
= (350 + 100) g = 450g
Now 450g of solution contains solute'X' = 100g
$\therefore 100$ g solution contains solute 'X'
$=\frac{100}{450}\times 100=22.2\%$