Question

if 4g of naoh dissolves in 40 ml of water . calculate the molarity of solution​

Answer 1

Explanation:

one moles of sodium hydroxide = 40 gm of sodium hydroxide. so we can said ; if want prepare 1 molar NaOH solution then we need 40 gm NaOH dissolve in one liter of water so it became one 1 molar NaOH solution.

Answer 2

The molar mass of NaOH is 40 g/mol.

The number of moles of NaOH is equal to the ratio of its mass to molar mass.

The number of moles of NaOH =

40g/mol

40g

=1mol

The molarity of NaOH solution is the ratio of number of moles of NaOH to total volume of solution in L.

M=

1L

1mol

=1M