Question 398372
How much 15% acid solution should be added to 40 ml of a 6% solution to get a 7% acid solution?
.
Let x = amount of 15% acid solution added
then
.15x + .06(40) = .07(40+x)
.15x + 2.4 = 2.8 + .07x
.08x + 2.4 = 2.8
.08x = 0.4
x = 0.4/.08
x = 5 ml