Question

The density of 2 molal aqueous solution of NaOH is 1.10g. Calculate the molarity of the solution.

Answer 1

DrBob222 Wednesday, May 20, 2015 at 9:38am

2 m is 2 mols/kg solvent 
2 mols NaOH = 2*40 = 80 g NaOH 
Total mass solution is 1000 + 80 = 1080 g. 
mass = volume x density. You know the density and mass, solve for volume, then M = mols/L

Answer 2

Answer:

0.045 M

Explanation:

The density of 2 molal aqueous solution of NaOH is 1.10g.

2 molal aqueous solution means 2 moles of NaOH present in 1000g of solvent.

Volume= 1000× 1.10 = 1100

M = Given wt. × 1000/molecular wt. × wt. of solution

M = 2 × 1000 / 40 × 1100

= 1 /22

= 0.045 M