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 ~ 3.53 liters of pure acid