Question

Casey is completing an experiment that requires 300 ml of potassium chloride (PCl) at a concentration of 0.2 M. But Casey's lab only stores potassium chloride at concentrations of 0.1 M and 0.5 M. How much 0.1 M PCl will Casey have to mix with 0.5 M PCl to make 300 ml of 0.2 M PCl?

Answer 1

Molarity = Moles of solute / liters of solution

Assume Casey uses x liters of 0.1 M PCl

How many liters of 0.5 M PCl will be needed to make the total volume of the solution to be 300 ml or 0.3 liters?