Casey is completing an experiment that requires a 300 ml solution with a 20% concentration of potassium chloride (kcl). but casey's lab only stores potassium chloride at concentrations of 10% and 50%. how much 10% kcl solution will casey have to mix with 50% kcl solution to make 300 ml of 20% kcl solution?

            We have to mix 10% KCl solution with 50%  KCl solution to get 20% concentration.            We have x mL of 10% solution and y mL of 50% solution.            20% - 10% = 10% and 50% - 20% = 30%            x : y = 30 : 10            x : y =  3 : 1            x = 3 y            x + y = 300            3 y + y = 300            4 y = 300            y = 300 : 4            y = 75            x = 300 - 75 = 225 Casey will have to mix 225 mL 10% KCl solution with 75 mL 50% solution.
           

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