Answer to Question #16038 in Algebra for mike

Question

10. The pharmacist has asked you to weigh out 20 grams of menthol and dissolve it in sterile water to make a 5% solution. Later you are asked to change the concentration to a 1% solution to fill an order that was just received. What will the final volume of a 1% solution be?

Answer 1

We need

M = 20[g]/0.01 = 2000[g]

of water to make 1% solution (no matter that we had 5% solution before). If the menthol is completely water soluble then the final volume will be 2 litres.