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?

Question 475177: 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 josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = ounces of alcohol to be added
In words:
( ounces of iodine in final solution) / ( total ounces of solution) = 4%
given:
Ounces of iodine started with =
---------------

15 ounces of pure alcohol must be added
RELATED QUESTIONS
A druggist wants to reduce a 20-ounce quantity of a 7% solution of iodine to a 4%... (answered by jorel1380)

A pharmacist has 4 quarts of a 15% solution of iodine. How much alcohol must be added to... (answered by Alan3354)

A chemist has 40 ounces of a solution of iodine and alcohol, which is 15% iodine. How... (answered by mananth)

A chemist has 40 ounces of a solution of iodine and alcohol that is 15% iodine. How much... (answered by lwsshak3)

A Chemist has a mixture that is 10% iodine and another that is 50% iodine. How much of... (answered by stanbon,oberobic)

How much pure water must be mixed with 15 ounce of a 30% alcohol solution to obtain a 25% (answered by josmiceli)

how many ounce of a 15% alcohol solution nmust bemixed with 4 ounces of a 20 % alcohol... (answered by stanbon)

how much alcohol in pints must be added to 80 pints of a solution of alcohol and iodine... (answered by nerdybill)

how much pure alcohol should be added to 24 ounce of a 45% solution in order to obtain... (answered by Fombitz)