Chemical elements
  Selenium
    Isotopes
    Energy
    Production
    Application
    Allotropy
    Colloidal
    Physical Properties
    Chemical Properties
      Hydrogen Selenide
      Selenium Fluorides
      Selenium Monochloride
      Selenium Tetrachloride
      Selenium Monobromide
      Selenium Tetrabromide
      Selenium Chlorobromides
      Selenium Oxyfluoride
      Selenium Oxychloride
      Sulphur Selenium Oxytetrachloride
      Selenium Oxybromide
      Chloroselenic Acid
      Selenium Dioxide
      Selenious Acid
      Selenium Trioxide
      Selenic Acid
      Selenates
      Perselenic Acid
      Selenium Sulphoxide
      Selenotrithionic Acid
      Diselenotrithionic Acid
      Selenopentathionic Acid
      Selenium Nitride
      Nitrosylselenic Acid
      Phosphorus Subselenide
      Phosphorus Monoselenide
      Tetraphosphorus Triselenide
      Phosphorus Triselenide
      Phosphorus Pentaselenide
      Phosphorus Chloroselenide
      Selenophosphates and Oxyselenophosphates
      Carbon Diselenide
      Carbon Subselenides
      Carbon Oxyselenide
      Carbon Sulphidoselenide
      Cyanogen Monoselenide
      Cyanogen Diselenide or Selenocyanogen
      Cyanogen Triselenide
      Selenocyanic Acid
      Ammonium Selenocyanate
      Caesium Triselenocyanate
      Copper Selenocyanate
      Lead Selenocyanate
      Magnesium Selenocyanate
      Mercurous Selenocyanate
      Mercuric Selenocyanate
      Potassium Selenocyanate
      Silver Selenocyanate
      Sodium Selenocyanate
      Zinc Selenocyanate
      Silicon Selenide
    Detection and Estimation

Chloroselenic Acid, (SeO3.HCl)2






Chloroselenic Acid, (SeO3.HCl)2, has been described as a pale yellow liquid obtained when dry hydrogen chloride and selenium trioxide are allowed to combine in a cooled vessel. It has a density of 2.26, and solidifies at -46° C. It fumes in air owing to the escape of hydrogen chloride, which gas is also evolved on heating, selenium and selenium dioxide remaining.

Chloroselenic acid dissolves readily in water, much heat being evolved and selenic and hydrochloric acids being formed. It is decomposed by alcohol with precipitation of selenium. It dissolves without decomposition in selenium oxychloride, but is insoluble in benzene, carbon tetrachloride, chloroform and ether.

Molecular weight determinations give values in agreement with the double formula.

When selenium dioxide is similarly treated with dry hydrogen chloride, two additive compounds, SeO2.4HCl and SeO2.2HCl, are obtained. The former is a yellow acicular crystalline solid, stable at 0° C., whilst the latter is a yellow liquid stable up to 170° C. and dis- tillable at this temperature with some decomposition into its constituents. The liquid can absorb hydrogen chloride in amounts varying with the temperature. By the action of dehydrating agents selenium oxychloride may be obtained.

With hydrogen bromide, selenium dioxide produces a rather more stable crystalline compound, SeO2.4HBr.


© Copyright 2008-2012 by atomistry.com