How much water must be evaporated from 60 kilograms of a 15 salt solution in order to obtain a 40% solution?
The initial strength of the solution is 15% m/m. [Mass/Mass]
That means, the salt present in the solution is =
The water present =
If we evaporate some of the water off the solution, the salt should not change its mass, unless it decomposes or something like that.
Let's assume that we have evaporated
According to the condition,
That means 28.5 kg of water needs to be evaporated.