Question

Calculate the molarity of solution containing 0.5g of Naoh dissolved in 500cm³

Answer 1

Answer:

Explanation:

1 mol NaOH = atomic mass of Na + atomic mass of O + atomic mass of H = 23 + 16 + 1 = 40g.

0.5 g NaOH = 0.5 / 40 mol NaOH = 0.0125 mol of NaOH

500 ml of water = 500/1000 = 0.5 L

Now, molarity = number of moles of solute / total volume of the solvent

= 0.0125 / 0.5 = 0.025 mol/L.

thank you

Answer 2

Answer:

mass of the solute,W=0.5g

molar mass,M=40g

volume of the soln,V= 500ml=0.5L

Molarity,S=?

Molarity,S = W/MV

=0.5/40×0.5

= 0.025M