Question

A sample of sodium carbonate contains impurity of sodium
sulphate. 1.25 g of this sample are dissolved in water and
volume made up to 250 mL. 25 mL of this solution neutralise
20 mL of N/10 sulphuric acid. Calculate the percentage of
sodium carbonate in the sample.
[Ans. 84.9]
N​

Answer 1

Answer:

A sample of sodium carbonate contain sodium sulphate also. 1. 5 g of the sample is dissolved in water and volume raised to 250 mL. 25 mL of this solution requires 20 mL of 10NH2SO4 solution for neutralisation.

In a sample of sodium carbonate some sodium sulphate is also mixed. 1.25 g of this sample is dissolved and the volume made up to 250 mL. 25 mL of this solution neutralises 20 mL of

sulphuric acid. Calculate the percentage of sodium carbonate in the sample.