1. Structure of drug calcium carbonate , commonly known as limestone , limestone , stone powder which have : Molecular formula: CaCO3 Molecular Weight: 100.09 2. Physical properties White solid, odorless, odorless. There are two forms of amorphous and crystalline. Crystalline type can be divided into orthorhombic and hexagonal crystals, columnar or diamond. The relative density is 2.71 to 825-896.6°C, and it decomposes into calcium oxide and carbon dioxide at about 825°C. Melting point 1339°C, melting point 1289°C at 10.7 MPa. Hard to dissolve in water and alcohol. Reacts with dilute acid and emits carbon dioxide at the same time, showing an exothermic reaction. Also soluble in ammonium chloride solution . Almost insoluble in water. 3. chemical properties …show more content…
Decomposes into calcium oxide and carbon dioxide when heated to 900°C at 101.325 kPa. Heating calcium carbonate to 900°C under atmospheric pressure decomposes into quicklime and carbon dioxide (industrial CO2 production): (reaction conditions are high temperature ) Calcium carbonate reacts with dilute hydrochloric acid and is effervescent , producing calcium chloride , water and carbon dioxide (CO2 produced in the laboratory): Water mixed with CaCO3 will be fed with excess carbon dioxide and calcium bicarbonate solution will be formed. Calcium Carbonate reacts with a carbonate solution (rainwater) to produce calcium bicarbonate. To the turbid lime water, CO2 was introduced and the precipitate disappeared. The principle of these phenomena is: