Question

How many milliliters of a 10.6 M NaOH solution are needed to prepare 0.715 L solution of NaOH with a concentration of 0.550 M?

Answer 1

Answer:

The molarity of NaOH solution before dilution, M1 = 10.6 M

After dilution of NaOH,

Volume, V2 = 0.715 L

Concentration or molarity, M2 = 0.550 M

Let’s assume the volume before dilution is “V1”.

We know,

M1 * V1 = moles of solute = M2 * V2

⇒ 10.6 * V1 = 0.550 * 0.715

⇒ V1 = 0.3932 / 10.6 = 0.03709 L  

⇒ V1 = 0.0370 * 1000 ml = 37.09 ml

Hence, 37.09 ml of NaOH is needed.