6 AKT. 6. — T. HAGA. 



one-fourth of it being regenerated and the remaining fourth 

 reverting to its parent salts, of which the sulphite has suffered 

 oxidation to sulphate. 



ßß salt 



4HN0o + 4S AK2 = 4H0N(S0,K), 



ßß salt 



4HON(SO,K)2+ 2PbO, = -2[ON(SO;,KX,], + 2Pb(0H), ; 



ßß salt 



2[ON(S03K)o].3 4- HoO = 2(S03K)ON(S03K), + H0N(S03K), + NO^H 



oi'i salt 



2(S03K)0N(S03K), + 2H,0 =2(S03K)ONH(^03K) + 2HO(S03K). 

 The leturn of an ö^5'-salt to the state of its /9;9-isomeride can 

 hardly be looked upon as possible, its own production having 

 been due to oxidation of a fourth of the sul^ihonate groups into 

 acid-sulphate. 



Salts 



Dijwtasdum Hydroxylaynine-aß-disulphonate, — (SO^K) O NH 

 (SO3K). — PotassiuDQ hydroxylaminetrisulphonate, dissolved in ten 

 times its weight of warm water (it is much less soluble in cold water, 

 this Journ. 19, Art. 15, 8), soon begins to hydrolyse when its solu- 

 tion is quickly cooled and mixed with a drop of dilute sul2:)huric 

 acid just before it would otherwise crystallise out again. The 

 hydrolysis, to the end of its first stnge, is complete in about four 

 days. When the solution is deprived of sulphate and neutralised 

 by the addition of barium carbonate or hydroxide, filtered, and 

 evaporated, the new disulphonate is obtained in crystals, . to the 

 extent of at least two-thirds of the calculated yield. That 

 hydrolysis of the trisuli^honate proceeds to the extent shown in the 

 equation (see above) in about four days and then proceeds much 

 naore slowly, has been ascertained both acidimetrically and by esti- 

 mation of the sulphuric acid j^roduced. 



The di2)otassium salt is an anhydrous salt, about twice as 



