Question

2gm of the sodium hydroxide are dissolved in water and the solution made is 100ml calculate the molarity of the solution

Answer 1

Molarity (M) = no of moles of solute/volume in litres
n = weight / molecular weight
n = 2g / 40g
n = 1/20 moles
M = 1/ 20 × 0.1
M = 1/200
M = 0.0005