Question

What is molarity of a solution which is 10 w/v naoh?

Answer 1

Answer:

2.5 M or 2.5 mol/litres.

Explanation:

10% w/v means

Let the Vol. of solution be 100ml.

so, Weight of NaOH= 10gm

Now, no. of moles of NaOH = given weight / molar weight

                        = 10gm/40gm = 1/4 = 0.25 moles. (molar wt. of NaOH = 40gm)

Hence, Molarity = no. of moles of solute (here NaOH) / Vol. of Soln (in litres)

        M= (0.25/ 100 ) X 1000 = 2.5 mol/litres or 2.5 M solution.