Lithium Carbonate Tablets
Definition
Lithium Carbonate Tablets contain Lithium Carbonate.
The tablets comply with the requirements stated under Tablets and with the following requirements.
Content of lithium carbonate, Li2CO3
95.0 to 105.0% of the stated amount.
Identification
A small quantity of the powdered tablets, when moistened with hydrochloric acid and introduced on a platinum wire into a flame, imparts a carmine red colour to the flame.
Assay
Weigh and powder 20 tablets. Add a quantity of the powder containing 1 g of Lithium Carbonate to 100 mL of water, add 50 mL of 1m hydrochloric acid VS and boil for 1 minute to remove the carbon dioxide. Cool and titrate the excess of acid with 1m sodium hydroxide VS using methyl orange solution as indicator. Each mL of 1m hydrochloric acid VS is equivalent to 36.95 mg of Li2CO3.