Question

the molarity of a sodium hydroxide solution by dissolving 4g of in 250ml of water is
0.4M
0.1M
0.2M
0.8M​

Answer 1

Answer:

no.of moles =given mass/molar mass

4/40 =0.1

now,

molarity= no.of moles/volume of solution in litres

= 0.1/0.25

=0.4M