OXIMIDOSULPHOXATES OR öULPHAZOT.ATES. 75 



extremely rapidly hydrolysed, the best way to test their freedom from 

 sulphate is to digest them with sodium carbonate, lilter off and wash 

 the barium carbonate, and observe whether this dissolves i)erfecrly in 

 nitric or hydrochloric acid. 



Claus's experience may be accounted for by the presence of much 

 dipotassium oximidosulphonate in tlie mother-liquor, Avhich with 

 bari nm chloride very rapidly yields sulphate by hydrolysis. He refused 

 credence to Fremy's statement as to the formation of the dipotassium 

 salt when the K5 salt is precipitated by barium chloride and other 

 sdts, and consequently took no steps to protect himself against this 

 accident. 



On adding to a supersaturated solution of the dipotassium salt 

 warm baryta-water not in excess, a precipitate was obtained by us 

 somewhat poor in potassium ; but then neither a supersaturated 

 solution of the dipotassium salt nor a warm one of barium hydroxide 

 is a solution of much concentration, which is the condition for the 

 precipitate to contain much potassium. The composition of the 

 precipitate agrees with that for the formula Ba,K3(XSoO;);, 14HoÜ, 

 matching which, except as to water, there is a barium sodium salt 

 already described on a previous page : — 



Call'. Found. 



Ijarium 42'05 -liM4 



Potassium 4-01 4-19 



Sulphur 15-28 l'ro2 



Two mois, of dipotassium salt react with one mol. of barium 

 hydroxide to yield IjaKNSoO-, wliicli is resolved by water into 

 normal pcjtassium salt and normal barium salt retaining a twelfth of 

 the former, thus :■ — 



lSKJ~lXS,O,4-01k(OII),=FxiJv3(N8,O0r + llK3NSA + 18H.,ü. 

 To sh(3\v the effect of adding the barium hydroxide in greater 



