How many kilograms of water must evaporate from 8kg of a 25% salt solution to produce 40% salt solution?

The kilograms of water must evaporate from 8kg of a 25% salt solution to produce 40% salt solution is 3 kg.

Explanation:

According to the ratio and proportion:

where,

= concentration of ist solution = 25%

= mass of ist solution = 8 kg

= concentration of second solution = 40%

= mass of second solution = ? kg

Thus the final solution must have a mass of 5 kg , i.e (8-5)= 3 kg of mass must be evaporated.

Therefore, the mass that must be evaporated from 8kg of a 25% salt solution to produce 40% salt solution is 3 kg.