Question

10 g of caustic soda dissolved in 100 mL of water makes a solution of caustic soda. Amount of caustic soda needed for 1 litre of water to make the same type of solution is ______.

Answer 1

10 g of caustic soda dissolved in 100 mL of water makes a solution of caustic soda. Amount of caustic soda needed for 1 litre of water to make the same type of solution is 100 g.

Explanation:

Given, 10 g of caustic soda dissolved in 100 mL water.

The ratio of caustic soda to water should be in proportion.

10 g : 100 mL :: x g : 1 L

`(10  g)/(100  mL) = (x  g)/(1000  mL)`  ...[∵ 1 L = 1000 mL]

⇒ x g × 100 mL = 10 g × 1000 mL  ...[By cross-multiplication]

`x = (10  g xx 1000  mL)/(100  mL)`

x = 100 g