Calculate volume of a solution

Question

Calculate the volume in mL of a 10 M NaOH stock solution required to make 500 mL of 100 mM NaOH? Answer should be in one decimal place

Answer 1

Dilution problem:

M1V1 = M2V2

M1 = initial molarity = 10 M

V1 = initial volume = ?

M2 = final molarity = 100 mM = 0.1 M

V2 = final volume = 500 ml

(10 M)(x ml) = (0.1 M)(500 ml)

x = 5.0 ml of 10 M NaOH is needed