A treatise on chemistry. Vol. II, Metals. Part II / by H.E. Roscoe & C. Schorlemmer ...

  • Roscoe, Henry E. (Henry Enfield), 1833-1915.
Date:
1880
Catalogue details

Licence: Public Domain Mark

Credit: A treatise on chemistry. Vol. II, Metals. Part II / by H.E. Roscoe & C. Schorlemmer ... Source: Wellcome Collection.

Provider: This material has been provided by University of Bristol Library. The original may be consulted at University of Bristol Library.

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    At 10 15°-6 37°-8 100' ICg(C3N3),Fe2 33 0 36-6 397 588 77-6 and 82 parts at 10i°, the boiling-point of the saturated solution. It is only slightly soluble in alcohol. When exposed to liglit the solution becomes darker, and a blue precipitate is formed, ferrocyanide remaining in solution. When the salt is heated in a flame it burns, and when mixed with nitrate of ammonia and Fig. 158. Fig. 159. heated the mixture detonates. It is a powerful oxidising agent, especially in alkaline solution, converting the monoxides of lead and manganese into dioxides, and forming potassium chromate and ferrocyanide of potassium, when boiled with solution of chromium sesquioxide in potash: 3K6(G3¥3)iFe2+ Cr203 + lOKOH = 3K8(C3l^3)4re2 + 2K.,CrO, + 5H2O. When its solution is acted upon by sodium amalgam, sodium potassium ferrocyanide is formed. Hydrogen dioxide converts potassium ferricyanide into ferrocyanide : 41^6(03^3)4^^6, + 4H2O2 = SK,(G,-N,)Je, + B,(C,-N,),Ye, + 40,, whilst on the other hand hydrogen dioxide oxidises a neutral solution of the yellow salt to ferricyanide (Weltzien) : K,(C,-N,),-Fe, +11,0, = K,(C3N3),Fe2 + 2K0H. Sodium. Ferricyanide, '^^^{O^^^e, + HgO, is obtained by the action of chlorine upon sodium ferrocyanide. It dissolves in 125 parts of boiling, and 5'3 parts of cold water, and crystallises in ruby-red four-sided prisms which deliquesce on exposure to air. Fotassium Sodium Ferricyanide, 15a3K3(C3N3)4Fe2, crystallises