What volume of a 0.20 M NaOH solution would a student need to make 500 mL of a 0.10 M NaOH solution?

Answer 1

Simple dilution:

V1M1 = V2M2

(x ml)(0.20 M) = (500 ml)(0.10 M)

x = 250 ml of 0.20 M diluted to 500 ml