A pharmacist wishes to mix a solution that is 5% Minoxidil. She has on hand 80 ml of a 4% solution and wishes to add some 7% solution to obtain the desired 5% solution. How much 7% solution should she add? ... ?

Question

Chemistry

Neveah Le

1 July, 21:38

A pharmacist wishes to mix a solution that is 5% Minoxidil. She has on hand 80 ml of a 4% solution and wishes to add some 7% solution to obtain the desired 5% solution. How much 7% solution should she add? ... ?

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Answers (2)

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Wendy Hooper · Answer 1

The 80 ml solution has (.04) (80) ml of the medicine, or 3.3 ml of medicine. The pharmacist adds V ml of 7% solution, or. 07V ml of medicine. The total amoune of medicine is (.07V + 3.2) mg. The total volume of solution is (V + 80) ml, so (.07V + 3.2) / (V + 80) =.05.

Solve for V.

V = 40 ml.

Kenya Chan · Answer 2

The 80 ml solution has (.04) (80) ml of the medicine, or 3.3 ml of medicine. The pharmacist adds V ml of 7% solution, or. 07V ml of medicine. The total amoune of medicine is (.07V + 3.2) mg. The total volume of solution is (V + 80) ml, so (.07V + 3.2) / (V + 80) =.05. Solve for V.