Potassium dichromate of mass 4.913 g was dried at 103°C in an oven
for two hours. The dried sample was then added to 500 ml of distilled
water. Concentrated Sulphuric acid of 167 ml and 33.3 g of Hg2SO4 was
then added to the dichromate solution. The mercury sulphate (Hg2SO4)
was added and the solution dissolved at room temperature. Distilled
water of 100 ml was added to the solution.