Casey is completing an experiment that requires 300 mL of potassium chloride (KCl) 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 KCl will Casey have to mix with 0.5 M KCl to make 300 mL of 0.2 M KCl?
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