A pharmacist wishes to mix a solution that is 4% Minoxidil. She has on hand 60 ml of a 3% solution and wishes to add some 6% solution to obtain the desired 4% solution. How much 6% solution should she add?
She should add 30ml.
We can express concentration as amount of solute/volume of solution or:
So the amount of substance
In this problem the total amount of