Chemical elements
  Titanium
    Isotopes
    Energy
    Preparation
    Physical Properties
    Chemical Properties
      Titanium Trifluoride
      Titanium Tetrafluoride
      Hydrofluotitanic acid
      Potassium Titanifluoride
      Sodium Titanifluoride
      Titanium Dichloride
      Titanium Trichloride
      Titanium Tetrachloride
      Titanic Chloride
      Titanium Oxychlorides
      Hydrochlorotitanic Acid
      Addition Compounds of Titanium Tetrachloride
      Titanium Tribromide Hexahydrate
      Titanium Tetrabromide
      Titanic Bromide
      Hydrobromotitanic Acid
      Titanium Chlorobromides
      Titanium Di-iodide
      Titanium Tri-iodide
      Titanium Tetra-iodide
      Titanic Iodide
      Titanium Monoxide
      Titanium Sesquioxide
      Titanium Dioxide
      Titanic Oxide
      Titanic Hydroxides
      Metatitanic Acid
      Titanates
      Titanium Monosulphide
      Titanium Sesquisulphide
      Titanium Disulphide
      Titanium Sulphates
      Titanous Sulphate
      Titanium Sesquisulphate
      Complex Sulphates of Tervalent Titanium
      Normal Titanic Sulphate
      Potassium Titanisulphate
      Potassium and Ammonium Titanylsulphates
      Titanous Nitride
      Titanic Nitride
      Titanamide
      Titanium Nitrogen Halides
      Titaninitric Acid
      Titanium Phosphide
      Titaniphosphoric Acid
      Titanium Carbide
      Titanium Cyanonitride
      Titanium Thiocyanates
      Titanium Sesquioxalate
      Titanitartrates and Allied Salts
      Titanium Silicide
      Pertitanates

Hydrofluotitanic acid, H2TiF6






Hydrofluotitanic acid, H2TiF6, is not known in the pure state, but is formed in solution when titanic oxide is dissolved in aqueous hydrofluoric acid, the heat of solution being:

[Ti(OH)4, 6HF, aq.] = 30,900 calories.

As a result of this reaction the solution increases in electric conductivity, since hydrofluotitanic acid is a much stronger acid than hydrofluoric acid.

Numerous titanifluorides are known which generally correspond to the type M'2TiF6 and are isomorphous with the silici-, zirconi-, and stanni-fluorides.

Titanifluorides differ from silicifluorides in their behaviour when heated with concentrated sulphuric acid; for, owing to the comparative non-volatility of titanium tetrafluoride this latter compound is not vaporised, as is silicon tetrafluoride from a silicifluoride under similar conditions, but the titanium is converted quantitatively into titanic oxide. On this account titanium tetrafluoride cannot be prepared by heating calcium fluoride and titanic oxide with sulphuric acid.

The titanifluorides are formed by the union of their component fluorides, and, like various other complex salts, are characterised by sparing solubility in water.
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