22 ART. 15— TAMEMASA HAGA. 



2(S0 3 K) 2 NO-OH+H 2 0=(2S0 4 KH+N0 3 H)+(S0 3 K) 2 NOH. 



Or, it may Avell hydrolyse wholly into sulphate and nitrous oxide, 



2(S0 3 K) 2 NO-OH + H 2 0=4S0 4 KH + X 11 0. 

 These equations combined with the primary equation give, 



2(S0 3 K) 4 N 2 2 +3H 2 0=2S0 4 KH+3(S0 3 K) 2 lsrOH+N0 2 H ;...(3) 



2(S0 3 K) 4 N 2 3 +3H 2 0=4S0 4 KH+2(S0 3 K) 2 NOH+N 2 (4) 



An equation to account for the production of nitrogen, and 

 another for that of aminemonosulphonate are easily framed : 



(S0 3 K) 4 N 2 2 +2H 2 0=4S0 4 KH+N 2 ; (5) 



(S0 3 K) 4 N 2 2 +3H 2 0=3S0 4 KH+(S0 3 K)NH 2 +N0 2 H (6) 



A justification of the lower of these equations and an illustration of the 

 nature of the change expressed by it are to be found in the production 

 of aminemonosulphonate from hydroxylaminedisulphonate when 

 decomposing in presence of copper sulphate (this Journ., 13 497). 



By combining these six equations in different ways, the various 

 results obtained can be explained (p. 42), although the conditions 

 for the occurrence of one mode of decomposition more than another 

 are not yet ascertained. 



Salutier 7 s Bluish- violet Acid. — Sabatier has studied the nature of 

 the bluish-violet colour produced in a solution of nitrososulphuric 

 acid (nitrosyl hydrogen sulphate) in the monohydrate of sulphuric 

 acid by sulphur dioxide, and in other ways (loc. cit. p. 3); 

 and has found this colour to be more closely like that of a solution 

 of potassium sulphazilate than the colour of the latter is like that of 

 a solution of potassium permanganate. On this ground and from 

 a consideration of the circumstances which give rise to it, he has 

 suggested that it is due to the presence in the solution of the acid of 

 Fremy's salt, constituted according to the formula, OX(SO :! H) 2 . 

 Sabatier may be right, but there is much to be said against this 

 opinion. Firstly, the tints of the two coloured solutions are not so 







