SOLUTION: A druggist wants to reduce a 20-ounce quantity of a 7% solution of iodine to a 4% solution by adding pure alcohol. How much alcohol must he add to accomplish this?
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Question 456726: A druggist wants to reduce a 20-ounce quantity of a 7% solution of iodine to a 4% solution by adding pure alcohol. How much alcohol must he add to accomplish this?
Answer by jorel1380(3719) (Show Source): You can put this solution on YOUR website!
20(.93)+n=.96(20+n)
18.6+n=19.2+.96n
.04n=.06
n=.6/.04=15
You need 15 ozs. of pure alcohol for your mix..
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