Chemical formula: CuO
Synonyms: cupric oxide
Amount: 100 g
Appearance and odour: heavy, dark brown-black powder without appreciable odour.
Packaging: professional wide necked, white HDPE bottle with blue conical seal cap and tamper ring. Labeled. Bottle and cap are UN approved and reusable.
Description and uses: copper (II) oxide is used in pottery glazing as a greenish pigment. Chemically it is quite inert and requires hot concentrated sulphuric acid or fusing with sodium bisulphate to enter solution. It's precursor to copper metal.
It can be used to demonstrate the (industrial) use of carbon (cokes) as a reducing agent for metal oxides: a mixture of CuO and finely ground carbon is heated in a test tube with a hot Bunsen flame. Carbon reduces the oxide to metal and CO/CO2 is formed. Copper sponge is left behind.
Another reducing agent for copper (II) oxide is aluminium powder in a Thermite (Goldschmidt) reaction. Note that this reaction needs considerable calcium fluoride to obtain actual lump copper metal.
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