Chemical elements
  Bismuth
    Isotopes
    Energy
    Production
    Application
    Physical Properties
    Chemical Properties
      Bismuth Trihydride
      Bismuth Trifluoride
      Bismuthyl Fluoride
      Bismuth Trichloride
      Bismuth Oxychloride
      Bismuth Chlorate
      Bismuthyl Perchlorates
      Bismuth Thiochloride
      Bismuth Selenochloride
      Bismuth Dibromide
      Bismuth Tribromide
      Bismuth Oxybromide
      Bismuth Thiobromide
      Bismuth Diiodide
      Bismuth Triiodide
      Bismuth Oxyiodide
      Bismuth Iodate
      Bismuth Thioiodide
      Bismuth Monoxide
      Bismuth Trioxide
      Bismuth Hydroxide
      Bismuth Tetroxide
      Bismuth Pentoxide
      Bismuth Hexoxide
      Bismuth Monosulphide
      Bismuth Trisulphide
      Bismuth Sulphites
      Bismuth Sulphate
      Bismuth Thiosulphates
      Bismuth Triselenide
      Bismuth Chromite
      Bismuth Nitride
      Bismuthyl Nitrite
      Normal Bismuth Nitrate
      Basic Bismuth Nitrate
      Bismuth Phosphide
      Bismuth Hypophosphite
      Bismuth Phosphite
      Bismuth Orthophosphate
      Bismuth Pyrophosphate
      Bismuth Thiophosphate
      Bismuth Arsenide
      Bismuth Arsenite
      Bismuth Arsenate
      Bismuth Carbonate
      Bismuth Cyanides
      Bismuth Thiocyanate
      Bismuth Chromothiocyanate
      Bismuth Orthosilicate
    Detection and Estimation

Bismuth Chromothiocyanate, Bi[Cr(CNS)6]






Bismuth Chromothiocyanate, Bi[Cr(CNS)6], has also been described.

When a solution of potassium thiocyanate is added to a solution of bismuth thiocyanate, an orange-red coloration is obtained; various considerations have led to the view that solutions of bismuth thiocyanate in thiocyanic acid contain bismuthothiocyanic acids. It is suggested that in concentrated solutions an acid of the formula H[Bi(CNS)4] is obtained, while in dilute solutions the tribasic acid, H3[Bi(CNS)6], is formed; in view of this, the formula of bismuth thiocyanate itself may be regarded as Bi[Bi(CNS)6]. In support of this hypothesis, a number of complex thiocyanates have been prepared, which can be represented as salts of tribasic bismuthothiocyanic acid. By adding potassium thiocyanate to an aqueous solution of bismuth nitrate and mannitol, precipitating the mannitol and potassium nitrate by addition of alcohol, and crystallising from the filtrate, red, non-hygroscopic crystals of potassium bismuthothiocyanate, K3[Bi(CNS)6], are formed. Another potassium salt, K3Bi(CNS)6.3KCNS, has also been obtained. In a similar manner corresponding salts of sodium and ammonium have been prepared, although not in a pure condition. By adding thallium acetate to potassium bismuthothiocyanate in appropriate proportions two complex salts of potassium and thallium have been obtained, namely, the orange-yellow salt K2TlBi(CNS)6, and the pale yellow salt KTl2Bi(CNS)6. Attempts to make the pure thallium salt failed. Among other salts of this type that have been obtained are the zinc salt, Zn3[Bi(CNS)6]2, as large, non-hygroscopic, orange-red crystals; the cobalt salt, Co3[Bi(CNS)6]2.15H2O, reddish-brown crystals, the colour of this salt supporting the view that a complex bismuth anion is formed, since Bi2[Co(CNS)4]3 would presumably be dark blue; the nickel salt, Ni3[Bi(CNS)6]2.10H2O, greenish-yellow; the vanadyl salt, (VO)3[Bi(CNS)6]2.7H2O, a reddish-violet powder; and the ferric salt, Fe[Bi(CNS)6], lustrous green crystals. The thallium salt of monobasic bismuthothiocyanic acid, Tl[Bi(CNS)4], has also been formed as red crystals.


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