412 Intelligence and Miscellaneous Articles. 



mixture of iodine and chlorate of potash, and this be treated with 

 hydrochloric acid, assisted with a gentle heat, the chlorate is decom- 

 posed, the iodine is totally dissolved, and the resulting chloride of 

 iodine combining with the alkaline chloride, formed at the same 

 moment, constitutes the same chlorosalt ; by operating in this me- 

 thod, it is easier to avoid an excess of chloride of potassium, which 

 frequently entirely prevents crystallization. 



3rd. If iodine be added to a solution of potash, and a current of 

 chlorine be passed through it, chloride of potassium and chloride of 

 iodine are formed, and the prismatic crystals of the chlorosalt soon 

 appear in the liquor ; care must be taken that the quantity of iodine 

 is sufficient, in order to form the salt, for, as already stated, an ex- 

 cess of the alkaline chloride greatly prevents crystallization. 



4th. The formation of the potassium chlorosalt is still more readily 

 effected if a current of chlorine be passed into a concentrated solu- 

 tion of chloride of potassium, mixed with iodine ; in this case, the 

 alkaline chloride, being ready formed, no more chlorine is required 

 than is requisite to saturate the iodine. 



5 th. If there be made a mixture of pure, solid iodic acid, with 

 hydrochloric acid, these two acids, as is well known, decompose 

 each other, with the disengagement of chlorine and the forma- 

 tion of chloride of iodine ; these solutions, incompletely saturated 

 with potash, soon deposit prismatic needles of a fine golden yellow 

 colour ; in this case, it is the same salt which is formed ; but there 

 is generally precipitated at the same time some iodate of potash. 



It is evident that these chlorosalts may be formed under various 

 circumstances, and probably others may be readily found besides 

 those now pointed out ; the simplest is that of mixing the two 

 chlorides. 



The conclusions which M. Filhol arrives at from the experiments 

 contained in the memoir, of which the foregoing is an extract, are : 



1st. That concentrated hydrochloric acid completely decomposes 

 the iodates into chloride of iodine, and chloride of the base of the 

 iodate, with the disengagement of chlorine. 



2. That weak hydrochloric acid decomposes iodate of potash, 

 forming bi-iodate of potash and chloride of potassium. 



3. That the chloride of iodine formed in the first case, is the 

 chloride ¥C\P, that is to say the actual perchloride. 



4. That the chlorides of potassium, magnesium, and hydrochlorate 

 of ammonia, combine with chloride of iodine, and form true chloro- 

 salts. 



5. That these chlorosalts are formed of an equivalent of each of 

 the two elements. 



6. That alkaline iodides are decomposed by chlorine, and may, 

 under the long-continued action of a current of this gas, give rise to 

 the same chlorosalts. 



7. That the salt resulting from the saturation of the chloride of 

 iodine, dissolved in hydrochloric acid by potash, is still the same 

 chlorosalt and contains no iodate. 



8. ITiat the salt resulting from the saturation of chloride of iodine 



