Double salts, formulas

Sulphate of the peroxide of iron does not crystallise, but forms crystallisable double salts. Formula Fe 0, 3 SO, or, Fe, 3 SO,. 

Sulphate of chromium does not crystallise, bnt forms ciystal-lisahle double salts. Formula Cr, O, 3 SO, or Cr, 3 SO. ... 

These are double salts which have the general formula... 

Double salts of general formula M2SO4 -FeS04.6H2O (M = alkali metal or ammonium) can be obtained by crystallisation of solutions containing the appropriate proportions of the two simple salts ... 

Iron(II) sulfate forms double salts of formula M2SO4 FeSO 6H20 with aLkaU sulfates. Iron(II) ammonium sulfate [7783-85-9] (Mohr s salt),... 

Several compounds of the CaO—P2O3—H2O system are given in Table 8. The common names for the mono-, di-, and tricalcium phosphates arise from the traditional double-oxide formulas, CaO 2i5p T2O3, 2CaO H2O +205, and 3CaO +205, respectively. These terms are routinely used in industry. With the exception of the monocalcium salt, the calcium phosphates are all sparingly soluble. 

Nickel dioxide, 77 107 Nickel double salts, 77 113 Nickel electrodes, 3 430 72 216 Nickel electroplating solutions, 9 818t Nickel extraction, 70 791 Nickel ferrite brown spinel, formula and DCMA number, 7 348t Nickel fibers, 77 108 Nickel fluoride complexes, 77 111 Nickel fluoride tetrahydrate, 77 109-110 Nickel fluoroborate, 77 111 Nickel fluoroborate hexahydrate, 4 157t, 158, 159... 

The basic dyes are usually marketed as chlorides, oxalates or zinc chloride double salts in the case of malachite green (6.162), the last-named derivative has the formula 3 [Dye]C1.2ZnCl2.2H20. Acid dyes of this type are often isolated as the sodium salt. 

Formula (NH4)2C03 H2O MW 114.10 not available in pure form crystalline products consist of double salts of ammonium carbonate, ammonium bicarbonate, and ammonium carbamate. 

The co-ordination theory lias also been applied to many complex salts and double salts other than ammines. For example, potassium ferrieyanide may be represented by the formula... 

The best known and most important compound belonging to the ammino-mercurie salts is the so-called fusible precipitate of composition HgCl2.2NH3, diammino-mercuric chloride. It was originally represented as a double salt of dimercuriammonium chloride and ammonium cliloride, Hg2NCl.NH4Cl, but this has been proved to be incorrect, and the addition formula is now accepted as the one which bears out its chemical behaviour. 

The best known of these compounds is potassium cobalti-nitrite, [Co(N02)6]K3.1 This salt was originally regarded as a double salt of cobaltic nitrite with potassium nitrite, and represented by the formula Co(NQ2)3.3KNOa. Such a formula, however, does not represent the reactions of the substance, as the nitrite radicle is held firmly, and nitrous aeid is not liberated when the compound is treated with cold dilute acids, as it would be if it were a double salt as the formula indicates. Molecular conductivity measurements also indicate that it is a complex salt comparable with the metal-ammines. Many compounds of cobalt of this type are known. They may be regarded as the salts of the complex acid hexanitrito-cobaltic acid, [Co (N02)6]H3. 

Later investigations by E. de Mondesir, V. von Zepharovich, T. M. Chatard, M. Soury, H. Lescceur, and J. Habermann and A. Kurtenacker favour the view that A. Laurent s formula, Na2C03.NaHC03.2H20, represents the composition of the double salt. Crystals of this salt were made by P. de Mond sir by the following process ... 

Double Salt of Cesium Dichromate and Cesium Decahydrodecaborate. USP 3256056 of June 14, 1966 of R.K. Armstrong (to DuPont Co) is described in CA 65, 8660(1966) as follows A B-contg compd is prepd which is suited for use in delay-producing compns, which ignite reliably and uniformly and has excellent resistance to impact and to static eLectricity. The compd has the formula... 

The crystals may contain both salts in definite molecular ratio. Their solution will, however, respond to tests for all of the ions originally present. Thus, carnallite, KCl-MgCl2,6H20, gives tests for the ions K+, Mg 1-1", and Cl-. Such salts are called double salts, and their formulas are written, as has just been illustrated, as a series of molecular formulas parted by periods. 

Solutions of the fixed alkalies convert it into black oxide, and by ammonia it is changed into the double salt, 2 (Mg KHa), Hg, 01, which is also black. This amide compound is different from that which is formed when calomel and dry ammonia are brought in contact the last has, according to Kane, the formula 2 Hgs C1,H NH ... 

The normal sulphates show a marked tendency to the formation of double salts,8 the best known case being that of the alums, which are isomorphous compounds of the general formula M2(S04)3.X2S04. 24H20, where M and X represent a tervalent and univalent metal, respectively in aqueous solution these double salts are almost entirely resolved into the ions of their constituent salts,9 recombination taking place as the solution crystallises. Double salts are also formed by the crystallisation of fused mixtures of anhydrous sulphates, the freezing-... 

The molecular weight and basicity of the acid were at one time in question, the fact that no acid salts are formed giving the incorrect impression that the acid was monobasic.6 By Ostwald s method for the determination of the basicity of an acid from the increase in the molecular conductivity of an aqueous solution of the sodium salt on dilution,7 and by measurement of the molecular weights of the salts in aqueous solution,8 it was subsequently demonstrated that the acid is dibasic and of the double molecular formula H2S206. 

A double salt of ammonium nitrate and sulphate, defined by the formula 2NH4N03-(NH4)2S04, is capable of detonating with a rate of 1000-1400 m/sec... 

Two series of double salts having the general formulae VOCla.4R.HCl. H20 and V0Cl2.2R.HCl.a H20, where R=quinoline or pyridine, are, however, known.8... 

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