Answer to Question #125224 in Inorganic Chemistry for Kenny

Question

A 4.85 g sample of anhydrous sodium sulfate is dissolved in water and the solution made up to 250 cm3 in a volumetric flask.
What is the concentration in mol dm−3 of sodium sulfate in the solution?

Answer 1

Concentration= amount of solute/volume im dm³

Solution in dm³ = 250/1000

=0.25dm³

now concentration in g/dm³=4.85/0.25

=19.4g/dm³

Molecular mass of sodium sulfate is 142.04

Now concentration in mol/dm³ becomes,

19.4/142.04

=0.13mol/dm³