Chemical elements
    Physical Properties
    Chemical Properties
      Lead Tetramethyl
      Lead Tetraethyl
      Lead Tetraphenyl
      Lead Ethoxide
      Lead Fluoride
      Lead Tetrafluoride
      Hydrofluoplumbic Acid
      Lead Chloride
      Lead Chloride Double Salts
      Basic Lead Chlorides
      Lead Tetrachloride
      Ammonium Plumbichloride
      Lead Chlorite
      Lead Chlorate
      Lead Perchlorate
      Lead Dibromide
      Double Salts of Lead Bromide
      Basic Lead Bromides
      Lead Bromate
      Lead Iodide
      Lead Iodide Complex Salts
      Basic Lead Iodides
      Lead Tetra-iodide
      Lead Iodate
      Lead Periodates
      Lead Suboxide
      Lead Monoxide
      Lead Hydroxides
      Lead Dioxide
      Plumbic Acids
      Hexahydroxyplumbic Acid
      Colloidal Plumbic Acid
      Potassium Plumbate
      Lead Plumbate
      Calcium Orthoplumbate
      Lead Orthoplumbate
      Red Lead
      Metaplumbic Acid
      Calcium Metaplumbate
      Lead Metaplumbate
      Basic Lead Plumbate
      Lead Sulphide
      Lead Sulphohalides
      Lead Polysulphide
      Lead Sulphite
      Lead Sulphates
      Lead Sulphate
      Basic Lead Sulphates
      Lead Hydrogen Sulphate
      Plumbic Sulphate
      Lead Persulphate
      Lead Thiosulphate
      Lead Dithionate
      Lead Selenide
      Lead Selenite
      Lead Selenate
      Lead Telluride
      Lead Tellurite
      Lead Azide
      Lead Azoimide
      Lead Hydrazoate
      Lead Imide
      Lead Hyponitrite
      Lead Nitrites
      Lead Nitrate
      Lead saltpetre
      Basic Lead Nitrates
      Lead Hypophosphite
      Lead Phosphite
      Lead Orthophosphate
      Lead Monohydrogen Phosphate
      Lead Dihydrogen Phosphate
      Lead Pyrophosphate
      Lead Metaphosphate
      Lead Arsenite
      Lead Orthoarsenate
      Lead Hydrogen Arsenate
      Lead Pyroarsenate
      Lead Antimonate
      Lead Carbonate
      White Lead
      Lead Formate
      Lead Acetate
      Sugar of Lead
      Complex Lead Acetates
      Plumbic Acetate
      Lead Tetra-acetate
      Lead Oxalate
      Lead Tartrate
      Lead Silicates
      Lead Borates
      Normal Lead Chromate
      Lead Dichromate
      Basic Lead Chromate
      Lead Molybdate
      Lead Tungstate
      Lead Metatungstate
      Lead Diuranate
      Lead Peruranate
    PDB 1afv-3qjk

Lead Nitrites

Besides normal lead nitrite numerous basic salts have been described, as well as a compound of nitrite and nitrate, formerly known as hyponitrate. These products have been obtained by the action of finely divided lead on a solution of lead nitrate or by the hydrolysis of lead nitrite. Lorenz described fifteen of such compounds, and Peters no less than twenty-eight. No doubt many of these supposed compounds were mixtures, and, therefore, it became an important and difficult problem to decide what individual compounds really exist. Our knowledge upon this subject is due largely to the work of Chilesotti, who has given a resume of the various lead nitrites which have been described, and submitted them to a critical examination.

Normal lead nitrite, Pb(NO2)2, is prepared by mixing equivalent proportions of solutions of lead chloride and silver nitrite at 25° C., and concentrating the filtrate by freezing, followed by evaporation over sulphuric acid. The monohydrate Pb(NO2)2.H2O was thus obtained in yellow, transparent prisms, and subsequently the anhydrous salt Pb(NO2)2, mixed with a little lead oxide and nitrate. The electric conductivity of lead nitrite in concentrated solution is somewhat less than that of the nitrate or chloride; but on dilution the differences become small. It is probable, from their conductivity and their intense yellow colour, that solutions of lead nitrite contain complex anions of the type Ag(NO2)2' or Hg(NO2)4'. Lead nitrite solution slowly decomposes thus:

3Pb(NO2)2 + 2H2O = Pb(NO3)2 + 2Pb(OH)2 + 4NO,

a decomposition similar to that which nitrous acid itself undergoes; this reaction increases the conductivity of the solution. When a solution of lead nitrite is boiled and cooled, nacreous scales are deposited, having the composition

Pb(NO2)2.Pb(OH)2.H2O or Pb(NO3,NO2).Pb(OH)2.H2O;

and by further hydrolysis, 3PbO.N2O3.xH2O and 4PbO.N2O3.H2O are produced. These three, together with the salt Pb(NO2)2.Pb(OH)2, are the only basic lead nitrites recognised by Chilesotti. Pb(NO2)2.Pb(OH)2 may be regarded as a derivative of orthonitrous acid, N(OH)3, thus:

The existence of a nitrite-nitrate of lead has been investigated by Chilesotti by measurements of conductivity of mixed solutions of nitrite and nitrate. Owing to a change in the direction of the specific conductivity curve when the two salts are present in molecular proportions it is concluded that the two salts show some tendency to combine in the molecular ratio: Pb(NO2)2:Pb(NO3)2. Attempts to separate a solid salt were, however, unsuccessful. Several double nitrites of lead and the alkali metals have been obtained. 3KNO2.2Pb(NO2)2.xH2O crystallises in orange monoclinic crystals from a concentrated solution of lead acetate to which potassium nitrite has been added.

2KNO2.Pb(NO2)2.H2O is obtained when excess of KNO2 is added to lead acetate solution; according to Chilesotti, however, it is not pure, but mixed with the former salt.

CsNO2.Pb(NO2)2.H2O forms bright orange plates.

© Copyright 2008-2012 by