io Taylor, Hypoiodous Acid and Hypoiodites. 



alkali to one of iodine the solution is distinctly yellow, 

 and gives a deep blue colour with starch ; with two 

 equivalents of alkali the liquid is a very pale yellow, 

 and the colour with starch is much less intense ; with 

 three equivalents the liquid appears colourless, and gives 

 only a slight colour with starch, so that apparently the 

 reaction is all but complete, and with four equivalents 

 it is quite complete. 



It is probable that the character of this reaction has 

 something to do with the comparative failure to obtain 

 bleaching solutions when using iodine dissolved in 

 potassium iodide. It may also help to explain the fact 

 that in the action of ozone upon potassium iodide the 

 development of free iodine may proceed to quite a 

 remarkable extent, considering that its liberation must 

 be accompanied by the formation of an equivalent 

 amount of potash. It is clear, however, that, as there 

 is always a very large excess of potassium iodide present, 

 tnis must tend to prevent the formation of any but the 

 smallest amount of hypoiodite. 



In 1882 the paper by Lunge and Schoch on Calcium 

 Hypoiodite appeared. The authors criticised Schonbein's 

 work at some length. They objected to the importance 

 which Schonbein appeared to attach to the fact that his 

 solutions gave an evolution of oxygen with hydrogen 

 peroxide, pointing out that a mixture of potassium 

 iodide and iodate does the same thing. There is a 

 certain amount of weight in this objection, but not 

 much. It is quite true that a mixture of iodide and 

 iodate does evolve oxygen with hydrogen dioxide, but 

 only either on standing or when gently warmed ; whereas, 

 as I have already pointed out, the stronger hypoiodite 

 solutions which I have prepared give an immediate 

 violent effervescence on the addition of the peroxide. 

 Schonbein's dilute solutions certainly do not give oxygen 



