Calculate the volume

Question

Suppose you are working with a NaOH stock solution but you need a solution with a lower concentration for your experiment. 

Calculate the volume (in mL) of the 1.326 M stock NaOH solution needed to prepare 250.0 mL of 0.1239 M dilute NaOH solution

Answer 1

This is a common problem encountered in the lab.

The equation you need is

M1V1 = M2V2

My personal preference is to convert volumes to Liters.

M1= 1.326 M

M2 = 0.1239 M

V1 = X L

V2 = 250 mL = 0.25 L

V1 = M2V2 = 0.1239 M(0.25 L) = 0.023 L = 23 mL

M1 1.326 M