Asked by rhonda

How much water should be added to 20oz of a 15% solution of alcohol to dilute it to s 10% alcohol solution?

Answers

Answered by drwls
Let the number of oz of added H2O be x.

The mass of alcohol in the solution stays the same. Only H2O is added.

0.20*15 = 0.10(20 + x)

Solve for x.

3 = 2 + 0.1x

x = 1/0.1 = 10 oz
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