Silver oxide

Disilberoxid

Heavy, almost black, velvety powder

Fixed

7.2 g · cm -3

230 ° C ( decomposition)

Practically insoluble in water

Risk

0.01 mg · m-3

-31.1 KJ / mol

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Silver ( I) oxide ( Ag2O ) is a chemical compound selected from the group of oxides.

Production and representation

Silver ( I) oxide is the reaction product of the precious metal silver with oxygen.

Poured into silver nitrate solution sodium hydroxide or potassium hydroxide. Silver falls in the alkaline range as a brown precipitate of:

Properties

Silver ( I) oxide is a brown powder, which darkens when exposed to sunlight. Moist silver (I ) oxide is very little light sensitive and decomposes on drying something. It has a crystal structure of Cu2O - type with the space group Pn3 m (a = 4.752 Å ) and an enthalpy of formation of -30.5 kJ / mol. Slurries of silver oxide in water react distinctly alkaline, as in a reversal of the above reaction silver and hydroxide ions are formed.

Reversing the synthesis reaction is silver (I ) oxide upon heating again the elements silver, oxygen decomposed ( thermolysis ).

Air silver (I ) oxide reacts with carbon dioxide to silver:

Use

In the preparative organic chemistry, silver (I ) oxide is used in a variant of the Williamson ether synthesis.

Silver ( I) oxide is in thermal grease for forwarding the processor heat to the heat sinks in the computer, since it has a high thermal conductivity.