Chemical elements
    Physical Properties
    Chemical Properties
    Cuprous Compounds
    Complex Copper Compounds
    Cupric Compounds
      Cupric hydride
      Cupric fluoride
      Cupric chloride
      Copper hydroxide
      Cupric bromide
      Cupric iodide
      Cupric chlorate
      Cupric bromate
      Cupric iodate
      Cupric periodates
      Cupric oxide
      Copper peroxide
      Cupric hydroxide
      Cupric sulphide
      Cupric polysulphides
      Cupric sulphite
      Cupric sulphate
      Copper Sulphate
      Cupric selenide
      Cupric selenite
      Double Copper Selenates
      Cupric telluride
      Cupric dithionate
      Cupric tetrathionate
      Cupric hydrazoate
      Cupric nitrite
      Cupric nitrate
      Cupric phosphide
      Cupric hypophosphite
      Cupric phosphite
      Cupric orthophosphate
      Cupric pyrophosphate
      Cupric metaphosphate
      Cupric arsenate
      Cupric metantimonite
      Cupric pyroantimonate
      Cupric metantimonate
      Cupric acetylide
      Cupric carbide
      Cupric carbonates
      Cupric cyanide
      Cupric thiocyanate
      Cupric silicates
      Cupric metaborate
      Cupric acetate
    PDB 1a2v-1bxu
    PDB 1bxv-1fwx
    PDB 1g3d-1j9t
    PDB 1jcv-1mfm
    PDB 1mg2-1paz
    PDB 1pcs-1sii
    PDB 1sjm-1w6w
    PDB 1w77-2afn
    PDB 2ahk-2dv6
    PDB 2dws-2ggp
    PDB 2ghz-2mta
    PDB 2nrd-2vm3
    PDB 2vm4-2yah
    PDB 2yam-3bkt
    PDB 3bqv-3fyi
    PDB 3g5w-3mie
    PDB 3mif-3t6v
    PDB 3t6w-9pcy

Cupric sulphide, CuS

By adopting special experimental precautions, it is possible to prepare Cupric sulphide, CuS, free from cuprous sulphide and sulphur by precipitating a solution of cupric sulphate or chloride with hydrogen sulphide, although if no precautions are taken the precipitate is likely to be contaminated with these substances. At 180° C. concentrated sulphuric acid converts copper into a mixture of cupric sulphide and sulphur, from which the sulphur can be removed by heating at 160° C. in a rapid current of hydrogen.

A crystalline variety of cupric sulphide is produced by heating cupric sulphate with ammonium thiocyanate above 180° C. The amorphous form can also be rendered crystalline by heating in a sealed tube with ammonium hydrogen sulphide at 150° to 200° C., the product consisting of lustrous, violet, hexagonal leaflets.

Cupric sulphide occurs in nature as covellite or indigo-copper, indigo-blue, hexagonal plates, density 4.59 to 4.64, and hardness 1.5 to 2. The dark-green, amorphous variety has the density 4.16, and is a good conductor of electricity. It is decomposed in vacuum at 400° C. into cuprous sulphide and sulphur. Its oxidation by air in ammoniacal, neutral, and acidic suspensions is similar to that of cuprous sulphide, but more energetic. Its heat of formation from its elements is 11.6 Cal. It dissolves readily in hot, dilute nitric acid, and in solutions of sodium polysulphides.

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