SOLUTION: How much water should I add to 10ml of a 10% acid solution to make it a 5% solution?

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Question 835974: How much water should I add to 10ml of a 10% acid solution to make it a 5% solution?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
.1*10=.05(10+x)
1=.5+.05x
.5=.05x
x=10