SOLUTION: How many liter of pure hydrochloric acid must be added to 60 liters of solution that is 10% hydrochloric acid to get a solution that is 15% hydrochloric acid?

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Question 438068: How many liter of pure hydrochloric acid must be added to 60 liters of solution that is 10% hydrochloric acid to get a solution that is 15% hydrochloric acid?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
How many liter of pure hydrochloric acid must be added to 60 liters of solution
that is 10% hydrochloric acid to get a solution that is 15% hydrochloric acid?
:
Let x = amt of pure acid required
:
.10(60) + x = .15(x+60)
:
6 + x = .15x + 9
x - .15x = 9 - 6
.85x = 3
x = 3%2F.85
x ~ 3.53 liters of pure acid