38 AKT. 1?,-TAMEMASA. HAGA. 



barium chloride, in order to keep the hydroxylaminedisulphonate in 



solution as far as possible. The impure sulphate, washed with 

 ammonium chloride solution on the filter, was transferred to a beaker 

 and digested in the cold with very dilute hydrochloric acid, washed 

 again on the filter with boiling water, and then ignited in the usaul 

 way. 



The hydroxylaminetrisulphonate was estimated by leaving the 

 solution with sodium amalgam for two days, occasionally shaking the 

 two together, so as to convert this salt into hydroxylaminedisulphon- 

 ate, and then all the hydroxylaminedisulphonate in the solution into 

 aminedisulphonate (iminosulpliate). The mercury Laying been 

 filtered off and washed, hydrochloric aeid was added to the solution 

 until it, was only just alkaline to methyl-orange, and then an 

 exeess of ammonium chloride was introduced. The sulphate was finally 

 precipitated and treated as before described. Deducting from this 

 quantity of sulphate that which was present before the treatment with 

 sodium amalgam, there remained the sulphate equivalent to one- 

 third of the sulphur of the hydroxylaminetrisulphonate, from which 

 the quantity of this salt was calculated. Assuming hydroxylamine- 

 disulphonate to be the only other sulphur compound produced in the 

 decomposition of the peroxylaminesulphonate— an assumption nearly 

 »xact — the amount of this salt was then calculated as being equivalent 

 to the sulphur not found either as sulphate or hydroxylaminetrisul- 

 phonate. The slight error in this assumption is caused by the produc- 

 tion of very small quantities of aminemonosulphonate (aniinosul- 

 phate). As to the last-named salt, it has not been possible to do more 

 than ascertain that its quantity is usually quite small, although 

 '1 mol. of the crystalline acid (p. ,*>(>) per KM) mol. of hydroxylamine- 

 disulphonate oxidised by the lead peroxide were once actually obtain- 

 ed. In ot her words, the amount of the sulphur found as aminemono- 



