Question

calculate the volume of pure water that used to dilute 100 ml of 12 M NaOH to 4.75 M.

Answer 1

Answer:

152.63 ml.

Explanation:

By proportion to get a 4.75 M solution the volume will be

(12/4.75) * 100 = 252.63 ml

So the answer is 152.63 ml.

Answer 2

molarity=number of moles/volume

First we find the number of moles of NaOH we have the molarity and the volume we transform mililiters in liters 100ml=0.1l

12=n/0.1 n=1.2 moles of NaOH

now we find the volume of the second solution

4.75=1.2/V

V=1.2/4.75=0.252l

0.252-0.1=0.152liters=152ml of pure water used to dilute