Copper monosulfide

• Covellite
• Cuprisulfid
• Copper monosulfide

Black solid

Fixed

4.6 g · cm -3

507 ° C ( decomposition)

Insoluble in water

0.1 mg · m-3

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Copper (II) sulfide, is a chemical compound of the copper and sulfur. It is a black, brittle solid with the empirical formula CuS. Despite this empirical formula are the connection not only Cu2 ions, but it consists of a mixture of Cu - and Cu2 ions. The exact ratio is Cu2ICuII (S2 ) S.

Occurrence

In the nature of copper (II ) sulfide occurs as the mineral covellite.

Production and representation

Copper (II ) sulfide is illustrated ( in the laboratory), by precipitation from aqueous solution, for example by passing in hydrogen sulphide.

High-purity copper (II ) sulfide, by reacting a copper (I) -sulfid/Schwefel-Mischung at room temperature.

Properties

Physical Properties

Copper (II ) sulfide is a black, water-insoluble solid, which occurs as a sulphide copper ore in nature. It is electrically conductive. In humid air, the ore copper (II ) sulfide is oxidized to copper sulfate. In dry air at room temperature, the compound is stable. , Copper (II ) sulfide is heated under exclusion of air, it decomposes at 507 ° C for copper ( I) sulphide, and liquid sulfur. However, the resulting copper sulfide is not established stoichiometric and can be described better by the shape of Cu2 - xS.

Roasting of the ore in air, however, leads to copper ( II) oxide and sulfur dioxide.

Copper (II ) sulphide has a hexagonal crystal structure with space group P63/mmc (a = 3.794 Å, c = 16.33 Å ) and an enthalpy of -48.5 kJ / mol.

Chemical Properties

Copper (II) sulfide, is soluble only in concentrated oxidative acids. For example, to react for 3 mol mol CuS conc 8. Nitric acid to form copper sulfate (3 mol), nitrogen dioxide (8 mol ) and water ( redox reaction ). In dilute acids it is insoluble. In the cation separation transition it is therefore already precipitated at pH 4-5 in the hydrogen sulfide group, dissolved in nitric acid and ammonia water detected as copper tetraamine ( evidence for cations detection reaction ).

Use

Copper (II) sulfide, is used for antifouling paints.

In the 1970s and 1980s, copper ( II ) sulfide used as cathode material in lithium batteries for pacemakers.