Question

Calculate the molarity of naoh in the solution prepared by dissolving 4gm water to form 250 ml of the solution

Answer 1

Hey mate !!

Here's the answer !!

We know that,

Molarity = Number of moles / Amount of soln ( in Litres )

Number of moles = Given mass / Molar mass

Given Mass = 4 g 

Molar mass = 40 g

So number of moles = 4 / 40 = 0.1 Mole

Amount of solution in litre = 250 ml / 1000 ml = 0.25 Litres

So Molarity = 0.1 / 0.25 = 0.4 M.

Hope my answer helped !!

Cheers !!