• How to get calcium?

    Elena Minkina
    Elena Minkina
    August 13, 2012
    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:

    1. Calcium Chloride Melt Electrolysis: CaCl2= Ca + Cl2
    2. 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.


    Related news


    How to behave on a date
    Top 10 most discussed celebrity weddings in 2014
    How to grow worms
    What Asparks
    What to consider when planning a wardrobe: 5 important nuances
    How to build a hexagon
    Natalie Portman is faced with an anomaly in the thriller Annihilation
    Is it possible to guess at Christmas