Question

If you have 14ml of a solution of 15% KOH and want to make 10ml of a 9% solution, how would you prepare the solution? You would add ml of the 15% KOH to a graduated cylinder and add ml of water.Answers should be numerical (eg, 1, not one)

Answer 1

M1=15%

M2=9%

V2=10 mL

V1=?

M1V1=M2V2

V1=M2V2/M1

=9 $\times$ 10/15

= 6 mL

take 6 mL of 15% KOH to a graduated cylinder and add 4 ml of water, to make 10 mL of 9% KOH solution.