Atomistry » Iridium » Chemical Properties
Atomistry »
  Iridium »
    Chemical Properties »
      Iridium Monochloride »
      Iridium Dichloride »
      Iridium Trichloride »
      Potassium Chloriridite »
      Sodium Chloriridite »
      Ammonium Chloriridite »
      Aquo Chloriridites »
      Iridium Tetrachloride »
      Potassium Chloriridate »
      Sodium Chloriridate »
      Ammonium Chloriridate »
      Silver Chloriridate »
      Thallium Chloriridate »
      Iridium Tribromide »
      Iridium Tetrabromide »
      Potassium Bromiridate »
      Sodium Bromiridate »
      Ammonium Bromiridate »
      Iridium Oxybromide »
      Iridium Tri-iodide »
      Potassium Iodiridite »
      Iridium Tetra-iodide »
      Potassium Iodiridate »
      Iridium Monoxide »
      Iridium Sesquioxide »
      Iridium Dioxide »
      Iridium Trioxide »
      Iridium Monosulphide »
      Iridium Sesquisulphide »
      Iridium Disulphide »
      Iridium Sesquisulphite »
      Potassium Iridium Sulphite »
      Iridium Sesquisulphate »
      Potassium Iridium Alum »
      Ammonium Iridium Alum »
      Caesium Iridium Alum »
      Rubidium Iridium Alum »
      Iridium Disulphate »
      Iridium Sesquiselenide »
      Hydrogen Iridi-nitrite »
      Potassium Iridi-nitrite »
      Sodium Iridi-nitrite »
      Ammonium Iridi-nitrite »
      Hydrogen Iridicyanide »
      Potassium Iridicyanide »
      Barium Iridicyanide »

Chemical Properties of Iridium

Iridium is not attacked by fluorine in the cold, but on warming to dull redness, vapours of the fluoride are evolved. Also, when employed as anode in the preparation of fluorine, it is rapidly attacked. Chlorine at red heat unites with iridium to form the trichloride; a mixture of chlorine and carbon monoxide at 240° C. has no action on the metal although platinum is attacked by it.

Finely divided iridium, when heated to redness in air, absorbs a certain amount of oxygen, forming an indefinite mixture of oxides. It is attacked by sulphur vapour at red heat, and under similar conditions phosphorus combines with it to form a fusible phosphide, which decomposes at white heat in a lime furnace, yielding the free metal.

Acids, even aqua regia, have no action on iridium, unless it is very finely divided, in which case it is very slowly attacked.

Fusion with a mixture of potassium hydroxide and nitrate results in the formation of iridates. Fused with potassium hydrogen sulphate it yields the sesquioxides. Alkalis alone have no action when fused with iridium.

Heated for some hours in a Bunsen burning with a smoky flame, an iridium crucible is unharmed, since the deposit of carbon can be entirely burnt away. Sulphur in the gas is likewise without effect. Prolonged ignition with copper renders the metal brittle, but the copper can be burnt off.

When strips of iridium are heated to high temperatures in carbon monoxide or in nitrogen, no loss in weight occurs. In carbon dioxide and in nitrogen containing oxygen appreciable losses in weight occur at 1500° C. upwards. This is attributed to the formation of oxide, which is volatile at these high temperatures.

Last articles

Zn in 7M6U
Zn in 7NNG
Zn in 7NEE
Zn in 7NEU
Zn in 7M3K
Zn in 7KWD
Zn in 7KYH
Zn in 7KNG
Zn in 7KY2
Zn in 7KYF
© Copyright 2008-2020 by atomistry.com
Home   |    Site Map   |    Copyright   |    Contact us   |    Privacy