Wheeler and Penfield — Alkaline Iodates. 131 



flat, transparent prisms separated on the yellow crystals of 

 CsCl . C1 3 I previously formed. These colorless prisms were 

 picked out from the solution dried on paper and separated me- 

 chanically, as far as possible from any adhering CsCl . C1 3 I. 

 These on analysis gave the following results. 



Found. Calculated for CsCl . HI0 3 . 



Caesium 



38-09 





38-60 



Iodine 



36-08 



36-29 



36-86 



Chlorine 



11-69 



11-82 



10-31 



Oxygen 



13-85 





13-94 



Hydrogen 



.30 





•29 



The crystals remain unaltered on exposure to dry air but on 

 treating them with water they immediately become opaque. 

 On recrystallizing from water they give 2CsI0 3 . I 2 5 . When 

 the substance is heated it gives off water and iodine chloride, 

 melts, and gives off oxygen, the residue consisting of chloride 

 and iodide of csesium. When it is warmed with hydrochloric 

 acid it undergoes the same decomposition as the corres23ond- 

 ing rubidium compound. 1 



KCl. KIO % . HIO y — This compound has previously been 

 prepared by treating KI0 3 with hydrochloric acid, or a solution 

 of iodine trichloride with potassium hydrate or carbonate. It 

 has been described by Serullas* and Kammelsbergt as anhy- 

 drous and the formula 2KC1 . 2KI0 3 . I 2 6 was assigned to the 

 salt. MillonJ from his determination of potash in this salt 

 concluded that the substance contained a molecule of water, 

 but he made no determination of it. Finally, Marignac§ who 

 examined it more carefully, made a determination of the water 

 by drying the substance at 100°, then igniting it in a tube 

 with metallic copper and collecting, and weighing the water 

 by means of a sulphuric acid tube. 



The compound obtained from a solution of KCl . C1 3 I sepa- 

 rated in shining transparent prisms, stable in the air. It con- 

 tained water corresponding to the formula 2KC1 . 2KI0 3 . I 2 6 

 . H 2 or KCl . KI0 3 . HI0 3 . An analysis of the air-dried salt 

 gave the following results. 



Calculated for 

 Found. KCl . KI0 3 . KI0 3 . 



16-83 16-82 



54-66 



V-64 



20-66 



•22 



* Ann. Ch. Phys., IT, xliii. 113. f Ann. Ch. Phys , III, ix. 407. 



% Pogg. Ann., xcvii. § Jahresb.. 1856, 298. Ann. Min., V, ix, 1. 



An. Jour. Sci. — Third Series, Vol. XLIY, No. 260. — August, 1892. 

 9 



Potassium 



Iodine 



Chlorine 



16-94 

 54-46 



7-72 



Oxygen 

 Hydrogen 



•20 



