Question

A solution is prepared by dissolving 20 g NaOH in
distilled water to give 200 ml of solution Calculate
the molarity of solution
(1) 2.28 M
(2) 10.7 M
(3) 3.65 M
(4) 25 M​

Answer 1

we know molarity is

Moles / volume (in litres)

Moles of NaOH present are 0.5

And the volume is 200 ml or 0.2 ml.

So the Molarity is

0.5/0.2 = 2.5 M