How to get calcium?
Calcium is a typical alkaline earth metal with pronounced metallic properties. That is why many chemical tasks are built on the methods of its preparation, as well as chemical properties.
How to get calcium
Metallic calcium can be obtained in two ways:
- Calcium Chloride Melt Electrolysis: CaCl2= Ca + Cl2
- Aluminothermic reduction of calcium from its oxide (CaO). The equation for this reaction is: 4CaO + 2Al -> CaAl2O4+ Ca
Metallic calcium should be stored under a layer of paraffin or kerosene, as This element is very active chemically and can enter into spontaneous reactions with water vapor and oxygen.
How to get calcium carbonate
Under the chemical name of calcium carbonate hides all known substances: chalk and marble. This chemical reaction is well known to all of us. It occurs at the time of boiling water in the kettle and the formation of scale - calcium carbonate.
Water always contains various salts, including calcium bicarbonate.When heated or evaporated water (which is observed in natural conditions), it decomposes and forms calcium carbonate:
Ca (HCO3)2-> CaCO3+ H2CO3-> CaCO3+ H2O + CO2
It is thanks to this reaction, the formation of calcium carbonate from its bicarbonate, in the caves appear surprisingly shaped columns and icicles hanging from the ceiling called stalactites and stalagmites.
How to get calcium carbide
Calcium carbide is used during welding. It is produced in industrial conditions from calcium carbonate, by heating the latter in a special furnace to a thousand and a half degrees. In this case, the dioxide (carbon dioxide) and carbon oxide (carbon monoxide) formed during it must be removed from the reaction zone.
CaCO3+ 3C = CaC3+ CO2+ CO
In the laboratory, to obtain calcium carbide requires a special burner and crucible made from special grades of heat-resistant glass. Well, at home to get calcium carbide is impossible.
How to get calcium oxide
Calcium is a very active metal that readily reacts with oxygen. As a result of this reaction, calcium oxide is formed:
2Sa + O2-> 2CaO
In fact, it is a combustion reaction, with the flame being colored orange-red.
How to get calcium chloride
Calcium can react with chlorine under normal conditions to form calcium chloride:
Ca + Cl2-> CaCl2
Calcium chloride is widely used in industry and medicine.
How to get calcium hydroxide
If we look at a number of standard potentials of metals, we note that in relation to hydrogen, calcium is to the left, and, therefore, this metal will react freely with water even under normal conditions with the formation of calcium hydroxide:
Ca + 2H2About -> Ca (OH)2+ N2+ Q
This reaction proceeds with the release of a large amount of heat, but fire, unlike the reaction of alkali metals with water, does not occur.