<PRE><B>Question 273772</B>
How many liters of water must be evaporated from 10 L of a 40% salt solution to produce a 50% solution?
:
Let x = amt of water to evaporated
:
Write an amt of salt equation (amt of salt remains unchanged)
.4(10) = .5(10-x)
4 = 5 - .5x
.5x = 5 - 4
.5x = 1
x = 2 Liters to be evaporated</PRE>