THE ACTION OF IODINE ON SOLUTIONS OF STANNOUS CHLORIDE
Journal of the American Chemical Society
HE action of free iodine on stannous chloride appears to T have been first studied by Henry.' H e states that when iodine is treated with an excess of a concentrated stannous chloride solution, bright red crystals of stannous iodide separate from the solution on cooling, while on concentration of the mother-liquors straw-yellow needles separate out, which consist of a definite compound, stannous chloro-iodide, SnICl or SnI,. SnC1,. This chloro-iodide was immediately decomposed by water, the
... d by water, the crystals turning red, and evidently being converted into stannous iodide, while the stannous chloride went into solution. If an excess of iodine was used, Henry obtained crystals of stannic iodide, on concentrating the solution. The results of his analyses are not in very good accord with the calculated numbers, which fact he ascribes to the difficulty of the analytical methods. More recently a paper has appeared by V. Thomas' concerning the action of dry stannous chloride on a solution of iodine in carbon bisulphide. As the conditions in Thomas' experiments were wholly different from those in ours, his paper need not be further mentioned. This paper embodies some preliminary results of an attempt to make a more thorough and concise investigation of the reaction. T h e method of experimentation was as follows : A concentra-1 Phil. Trans., 1843> 363. 2 Compt. vend., n i , 1539.