Posted by **cleondra** on Friday, August 3, 2012 at 1:08pm.

prepare 500 ml of a 1:5 solution using a 1:10 solution and a 1:4n solution. what quantities will be used of each stock solution to make the 1:5 solution?

- pharmacy calculations -
**MathMate**, Friday, August 3, 2012 at 3:42pm
500 ml of a 1:5 solution contains 500*(1/5)=100 ml. of the concentrate.

So if x is the volume of 1:4, then 500-x is the volume of 1:10.

Hence

x(1/4)+(500-x)(1/10)=500*(1/5)

Solve for x to get x=333.33 ml.

- pharmacy calculations -
**lisa**, Friday, August 31, 2012 at 6:41pm
a chemist needs 130ml of a 75% solution but has only 67% and 80% solutions available. find how many milliliters of each that should be mixed to get the desired solution.

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