Assay procedure for Calcium Carbonate

Assay Procedure

• Weigh accurately about 0.1 g and dissolve in 3 ml of dilute hydrochloric acid and 10 ml of water.
• Boil for 10 minutes, cool, dilute to 50 ml with water.
• Titrate with 0.05 M disodium edetate to within a few ml of the expected end-point, add 8 ml of sodium hydroxide solution and 0.1 g of calcon mixture and continue the titration until the colour of the solution changes from pink to a full blue colour.
• 1 ml of 0.05 M disodium edetate is equivalent to 0.005004 g of CaCO3.

Assay, calcium carbonate, dilute hydrochloric acid, disodium edetate, sodium hydroxide solution