24 AET. 15.— TAMEMASA HAGA. 



present ; the filtrate was then evaporated, and the hydroxylaminetri- 

 sulphonate crystallised out as far as possible and weighed. Potassium 

 nitrite, produced in large quantity, was estimated in the mother 

 liquor and alcoholic washings of the crystals of the hydroxy laminetri- 

 sulphonate by the urea method. Sulphate was found partly in 

 solution and partly in the lead residue, which was extracted 

 alternately with dilute nitric acid and potassium hydroxide. The 

 sulphate, both in solution and residue, was estimated and, in two 

 cases, the soluble lead also, as a measure of lead peroxide consumed. 



In one experiment, 73*2 grams of salt gave 58*2 grams of 

 trisulphonate in crystals, that is, 58*5 mol. of trisulphonate from 100 

 mol. of disulphonate, or 87.75 per cent, of the theoretical quantity. 

 Nothing else was determined, and so high a yield of hydroxylamine- 

 trisulphonate was only reached by adding alcohol to separate the last 

 portions of the salt from the very concentrated nitrite mother 

 liquor. 



In another experiment, 125 grams of the disulphonate gave 

 97*33 grains of trisulphonate, equal to 57*33 mol. of trisulphonate 

 to 100 mol. of disulphonate, or 86 per cent, of the calculated 

 quantity. The amount of potassium sulphate was 21*5 mol. per 

 100 mol. of salt taken, which leaves sulphur for the trisulphonate 

 equivalent to 59*5 mol., as against the 57'33 mol. of crystallised salt. 

 Very much nitrite was found, 37*5 mol. per 100 mol. of disulphonate 

 taken, indicating the production of very little nitrous oxide. The 

 only way to interpret this large production of nitrite is to assume 

 that, whilst 89'25 per cent, of the salt was oxidised into trisulphonate 

 and nitrite, and only 3 per cent, into sulphate and nitrous oxide, 

 7*75 per cent, was oxidised into sulphate and nitrite, an assumption 

 which cannot be easily justified. 



In an earlier experiment, in which the crystallisation of the 



