how many c.c of water must be evaporated from 200 c.c of a 8% salt solution to form a 12% salt solution?

Salt in 8% solution = .08 ( 200) = 16

How many cc are needed to make 12% with starting 16

 

.12 x = 16

x = 133.33 cc        so     200 - 133.33 = 66 2/3 water to be evaporated