Question

If 4 litres of water is evaporated on boiling from 12 litres of salt solution containing 7 % salt the percentage of salt in this remaining solution is

Answer 1

Answer:

The percentage of salt in remaining solution is 10.5%

Explanation:

According to the statement of the question a 12 litres salt solution contains

Salt =7 × 12/100  

= 0 84 . units

Water = 93 × 12 /100

= 11.16. units

Therefore  after evaporation,

Percentage of salt = 0.84 /8× 100 = 10.5%

Thus the percentage of salt in remaining solution is 10.5%

Answer 2

In 12 litres salt solution

In 12 litres salt solutionsalt= 0.84unit

In 12 litres salt solutionsalt= 0.84unitwater = 11.16 unit

In 12 litres salt solutionsalt= 0.84unitwater = 11.16 unitAfter evaporation,

In 12 litres salt solutionsalt= 0.84unitwater = 11.16 unitAfter evaporation,Percentage of salt

In 12 litres salt solutionsalt= 0.84unitwater = 11.16 unitAfter evaporation,Percentage of salt= 10.5%