Question

Find the volume of 5 molal 

H2SO4 solution.(p= 1.2g/ml) which should be added to 100ml of 98% H2SO4 solution.(p=1.8g/ml) in order to obtain 10 molal 

H2SO4 solution. 

Answer 1

A 2M solution will be 2 molar by definition. It is the last bit of data that worries me. Conc sulfuric acid has a density of 1.84 grams/ml. You cannot have it both ways.

Answer 2

• According to the question,

Molarity of 98 % pure(commercially available) sulfuric acid is 5

Now, we know,

V1 × N1 = V2 × N2

Let, V1= X, N1= 18.05, V2= 100 ml, N2= 5

So, X ×5 = 100× 10

Therefore, X= 200ml

So,200 ml is the volume of 5 molal H2SO4 solution.(p= 1.2g/ml) which should be added to 100ml of 98% H2SO4 solution.(p=1.8g/ml) in order to obtain 10 molal H2SO4 solution.