Question

A 10% (w/w) equous contains 5g salt in it, how much water Should be evaporated to make it 15% (w/w)​

Answer 1

Answer:

I think the explanation of the same if given in NCERT itself.

Answer 2

Answer:

As per the question

in 10% of w/w% solution

10 = 5/mass of solution(x) x 100

x = 100 x 5 ÷ 10

50 g

let water evaporated to make concentration 15% be x gram.

mass of solution = 50 - x

so , 15 = 5 / 50 - X x 100

x = 16.67 g

So the mass of water that should be evaporated = 16.67g