Calcium carbonate, it is "limestone" - it is inorganic chemical compound. In the nature it meets in the form of limy deposits and also in the form of chalk and marble. Mainly, the carbonate of calcium is applied in production of not extinguished lime, it is just treated to action of high temperatures, and it decays on lime and carbon dioxide. Also it is used in the food industry as dye.
It is required to you
- Calcium hydroxide, soda, the diluted sulfuric acid, water, ware.
Instruction
1. Place in any capacity hydroxideof calcium (extinguished lime) and fill in with hot water. Stir mix and let it stand. Then carefully pour liquid in other capacity, having separated it from a deposit. This liquid, represents saturated solution of hydroxide of calcium (lime water).
2. Further, take a test tube, fill in it a little baking soda (it is possible to use also the calcinated soda) and fill in it with the diluted sulfuric acid. Reaction with release of carbon dioxide will begin.
3. Then close a test tube a stopper with an exhaust tube, and ship other end of a tube in lime water. Carbon dioxide, getting to solution, begins to interact with calcium ions with formation of a carbonate of calcium. Solution considerably will dim. Take out a tube and let solution stand, the carbonate of calcium is badly soluble salt, it will settle on a bottom.