Chemical elements
  Cerium
    Isotopes
    Energy
    Production
    Application
    Physical Properties
    Chemical Properties
      Cerous hydride
      Cerous fluoride
      Cerous chloride
      Cerous oxychloride
      Cerous bromide
      Cerous iodide
      Cerous perchlorate
      Cerous bromate
      Cerous iodate
      Cerous oxide
      Cerous sesquioxide
      Cerous hydroxide
      Cerous sulphide
      Cerous persulphide
      Cerous oxysulphide
      Cerous sulphite
      Cerous sulphate
      Cerous dithionate
      Cerous selenite
      Cerous selenate
      Cerous chromate
      Cerous molybdate
      Cerous tungstate
      Cerous nitride
      Cerous nitrite
      Cerous nitrate
      Cerous hypophosphite
      Cerous orthophosphate
      Cerous vanadate
      Cerous carbide
      Cerous silicide
      Cerous carbonate
      Cerous thiocyanate
      Cerous platinocyanide
      Cerous oxalate
      Cerous silicate
      Ceric fluoride
      Ceric chloride
      Ceric iodate
      Ceroceric oxide
      Ceroceric hydroxide
      Ceric oxide
      Cerium dioxide
      Ceria
      Ceric hydroxide
      Perceric hydroxide
      Ceric hydrosulphate
      Ceric sulphate
      Ceric selenite
      Ceric chromate
      Ceric molybdate
      Ceric nitrate
      Ceric ammonium nitrate
      Ceric orthophosphate
      Ceric dihydrogen arsenate
      Ceric carbonate
      Perceric carbonate
      Ceric acetate
      Ceric oxalate
      Ceric acetylacetonate
      Ceric borate
    PDB 1ak8-1n65

Ceric hydroxide, Ce(OH)4






Ceric hydroxide, Ce(OH)4. - The normal hydroxide is not known. When ammonia or an alkali hydroxide is added to a solution of a ceric salt, a yellow, gelatinous precipitate of ceric hydroxide is obtained, insoluble in excess of precipitant; it is usually contaminated with basic salt and adsorbed alkali hydroxide. A pure hydroxide may be prepared from ceric ammonium nitrate by precipitation with ammonia from a cold solution, the precipitate being washed, allowed to become nearly dry at a low temperature, and again washed with cold water to remoye ammonium nitrate. When dried over potassium hydroxide, its composition corresponds with the formula Ce2O(OH)6 or 2CeO2.3H2O.

Ceric hydroxide may be conveniently prepared by the oxidation of cerous hydroxide. For this purpose excess of alkali hypochlorite or hypobromite may be added to a cerous salt, or, what amounts to the same thing, precipitation may be effected by alkali hydroxide and the oxidation then accomplished by the use of chlorine or bromine. Ceric hydroxide may also be prepared by heating hydrated perceric hydroxide to 120° or boiling its aqueous suspension until decomposition of the peroxide has been completed.

Ceric hydroxide dissolves in nitric or sulphuric acid with the production of a ceric salt, but reduction to the cerous state usually occurs to a slight extent. According to Brauner, the reduction is complete if the hydroxide has been prepared from perceric hydroxide and its solution in sulphuric acid is effected in a platinum dish, but this is denied by Barbieri. Ceric hydroxide reacts with hydrochloric acid to produce cerous chloride, chlorine, and water.

Colloidal ceric hydroxide may be prepared by dialysing a 10 per cent, aqueous solution of ceric ammonium nitrate for four or five days. The hydrosol thus obtained is very readily coagulated; when evaporated, it leaves a gummy residue, soluble in hot water. The hydroxide is positively charged.



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