To estimate the amount of barium in the whole of the given solution of barium chloride.
The Gravimetric Estimation of Barium:
The given barium chloride solution is made up to a definite volume. A measured volume of it is then treated with dilute sulphuric acid and then treated with dilute sulphuric acid and barium precipitated as barium sulphate.
The precipitated barium sulphate is separated and weighed. The mass of Barium in the whole of the given solution is calculated knowing that 233.36 g of barium sulphate contains 137.36 g of barium.
Note: For more details refer the theory of "Gravimetric Estimation of Nickel."