Chemical elements
  Cadmium
    Isotopes
    Energy
    Production
    Application
    Physical Properties
    Chemical Properties
      Cadmium Fluoride
      Cadmium Chloride
      Cadmium Bromide
      Cadmium Iodide
      Cadmium Chlorate
      Cadmium Perchlorate
      Cadmium Bromate
      Cadmium Iodate
      Cadmium Periodate
      Cadmium Suboxide
      Cadmium Oxide
      Cadmium Hydroxide
      Cadmic Hydroxide
      Cadmium Peroxide
      Cadmium Sulphide
      Cadmium Sulphite
      Cadmium Sulphate
      Cadmium Thiosulphate
      Cadmium Dithionate
      Cadmium Selenide
      Cadmium Selenites
      Cadmium Selenate
      Cadmium Telluride
      Cadmium Tellurite
      Cadmium Tellurate
      Cadmium Chromite
      Cadmium Chromate
      Cadmium Dichromate
      Cadmium Molybdate
      Cadmium Tungstate
      Cadmium Nitride
      Cadmium Azide
      Cadmium Amide
      Cadmium Nitrite
      Cadmium Nitrate
      Cadmium Phosphide
      Cadmium Hypophosphite
      Cadmium Orthophosphate
      Cadmium Pyrophosphate
      Cadmium Thiophosphates
      Cadmium Arsenide
      Cadmium Arsenite
      Cadmium Arsenates
      Cadmium Metantimonate
      Cadmium Carbonate
      Cadmium Thiocarbonate
      Cadmium Cyanide
      Cadmium Silicate
      Cadmium Borates
    PDB 1a4k-1exq
    PDB 1f48-1ihu
    PDB 1ii0-1mhu
    PDB 1mms-1qvg
    PDB 1qy0-1wb6
    PDB 1wje-2avp
    PDB 2b3p-2j6e
    PDB 2jdz-2x05
    PDB 2x09-3ccj
    PDB 3ccl-3ggf
    PDB 3h1u-3p5v
    PDB 3p5w-8ice

Chemical Properties of Cadmium






Cadmium burns, when heated in air, to a brown oxide. It was said to retain its brilliancy at ordinary temperatures, but it tarnishes in ordinary air.

Cadmium volatilises before it acts on water, but it can be converted into oxide by heating a mixture of cadmium vapour and steam. The reaction

Cd+H2OCdO+H2

is, however, reversible. If the metal is immersed in water a layer of hydrated oxide forms upon it.

Cadmium behaves towards acids very similarly to zinc. The heat of solution in aqueous hydrochloric acid has been determined thus -

Cd+2HCl.200H2O = CdCl2.400H2O+H2 + 17.230 Cal.

at 20° C. if the hydrogen is dry. The corresponding figure for moist hydrogen is 16.980 Cal.

Heated cadmium reacts more readily than zinc with sulphur dioxide, and is converted into a mixture of cadmium sulphate and sulphide.

Cadmium sulphide is produced when sulphurous acid acts on the metal. Sulphur is precipitated in the presence of hydrochloric or sulphuric acid, and the complete action may be complex. According to Fordos and Gelis, cadmium sulphite and hydrogen are first produced. The nascent hydrogen reduces the excess of sulphurous acid to hydrogen sulphide. The latter then precipitates some of the cadmium sulphite as sulphide. They obtained cadmium sulphite and sulphide by treating cadmium with sulphurous acid. Schutzenberger obtained the same products. Cadmium sulphide is also produced when cadmium is heated with sulphurous acid at 200° C. in closed vessels.


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