Manganic and Hy permanganic Acids ^ 6fc. 335 



bent tube attached to it, employed instead of a retort, to 

 allow the chloride of potassium to be deposited. 



0*600 gr. hyperchlorate of potash, yielded in one experi- 

 ment 192*1 C.C. oxygen gas, or by weight 0*275 gr. The 

 same quantity in another experiment gave 191*9 C. C. or 

 0*2749 gr. oxygen. Now, 



(600 - 275) : 275. :: 100 : 84*73 



If the hyperchloric acid contain 6 proportions of oxygen, 

 then for every 100 parts of chloride of potassium there 

 would be 75*04 of oxygen ; but if it contain 7, then each 

 100 parts of chloride of potassium would be combined with 

 85*76 parts of oxygen. The same proportion was obtained 

 by weighing the residue after the ignition of the perchlorate 

 of potash. And, although this experiment from the escape 

 of a small quantity of the chloride of potassium, can never 

 be so accurate as the former, yet it agrees with it very well. 

 2*7155 gr. ignited lost 1*2515 in weight, so that for 100 

 parts of chloride of potassium there were 85*5 of oxygen. 



5. Crystalline form of some Hypermanganates and Hyper- 

 chlorates. 



It follows from these experiments, that Stadion's result 

 is correct. The experiments on hypermanganic acid show 

 that it also contains seven proportions of oxygen. The 

 same difficulty which exists in the preparation of the hyper- 

 manganates, interferes also with that of the hyperchlorates. 

 The hyperchlorate of potash is the most difficult to decom- 

 pose of all the salts of that acid, so that the others can 

 only be formed by means of fluosilicic acid. I precipitated 

 the hyperchlorate of potash with the fluosilicates of am- 

 monia, copper, lead, and several others, or else I decom- 

 posed the salt by the fluosilicic acid, and then combined 

 the acid with a base. 



All the hyperchlorates, except those of potash and 

 ammonia, are very easily soluble in water. Most of them 

 are volatile, as for instance, the hyperchlorates of soda, 

 barytes, lime, copper, lead, and some more. The crystalline 

 form of the salt of silver, which is also very soluble, is 

 distinguishable, but not sufficiently so to measure. It is 

 soluble in ammonia and forms with it a crystallizable com- 

 pound. The only salts whose crystalline shape I have been 

 able to measure accurately, are the hyperchlorates of 



