SOLUTION: A chemist has 100ml of a 20% ammonia solution. How much water must be added to produce a mixture which is 8% ammonia?

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Question 822955: A chemist has 100ml of a 20% ammonia solution. How much water must be added to produce a mixture which is 8% ammonia?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
%281%2Fx%29%2A20=8
20=8x
x=20%2F8=5%2F2=2.5

Dilute the ammonia at 20%, to 250 mililiters. This gives your 8% ammonia.