Question

You are a lab technician and must create 250 ml of a 17% salt solution. You have available 3 stock solutions. You have a one liter container of a 5% salt solution, a 500ml container of a 28% salt solution, and a 400ml container of a 40% salt solution. Show the work necessary to calculate the cheapest method of preparing the 17% salt solution if the 5% solution costs $28 per liter, the 28% solution costs $38 per liter and the 40% solution costs $50 per liter.

Answer 1

One way to do it is to convert concentrations in % to g/L to Molar concentrations.
Then you can use M1Vi = M2V2 and solve for V2.