SOLUTION: a solution of 60 milliliters is 50% acid. how many milliliters of water must be added to create a 30% acid solution?

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Question 425453: a solution of 60 milliliters is 50% acid. how many milliliters of water must be added to create a 30% acid solution?
Answer by htmentor(1343) About Me  (Show Source):
You can put this solution on YOUR website!
50% solution means there are initially 30 milliliters of acid.
To dilute to 30% we need to find x such that
0.30 = 30/(60+x) -> 30 = 18 + 0.30x -> x = 12/0.30 = 40.
So we need to add 40 ml of water to make a 30% acid solution.