SOLUTION: How many cubic centimeters of pure hydrochloric acid should be added to 20cc of a 30% solution of hydrochloric acid to obtain a 50% solution?

Question 167665: How many cubic centimeters of pure hydrochloric acid should be added to 20cc of a 30% solution of hydrochloric acid to obtain a 50% solution?
Answer by nerdybill(7384) (Show Source): You can put this solution on YOUR website!
How many cubic centimeters of pure hydrochloric acid should be added to 20cc of a 30% solution of hydrochloric acid to obtain a 50% solution?
.
Let x = amount of pure hydrochloric acid added
.
.30(20) + x = .50(20+x)
6 + x = 10 + .5x
6 + .5x = 10
.5x = 4
x = 8 cc (amount added)
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