OXIMIDOSULPHOXATES OR «ÜLPHAZOTATES. 71 



mixture of a powdery precipitate and an abundant mother-liquor. 

 The precipitate was drained on a tile, and then had changed from a 

 powder to a horny hard mass.* This was ground (ine in a mortar 

 and dried in a good desiccator, the grinding being once or twice 

 repeated. Analysed it proved to be BaNaKSoO;, ILO with a little 

 Ba3(iVS,0;),. 9H,0 :— 



Bai8^''ii5(^'^L'07)i7. 21IL,0. Found. 



Barium aS'lO 38-36 38-01 



Sodium o'oo — o'25 



Sulphur 1(J-81 — 16-72 



Baruini potassium o.riniidosulpliojiates. — The normal potassium salt 

 decomposes so (piicklv in aqueous solution into tlie iive-sixths normal 

 salt and potassium hydroxide that constant and simple results would 

 probably not be obtained with it as a precipitating agent. AVe have 

 used, as Fremy did, the K5 ><-\lt, or with baryta the Ko salt. 



The secen-fiinths nonual salt, Vjn-Js.Jrl^(NS.fl^)s, 9HoO, is obtained 

 as a crystalline powdery precipitate when a concentrated solution of 

 barium chloride, two mois., is added to three or more mois, of the 

 five-sixths normal potassium salt in warm concentrated solution, this 

 salt, it should be remembered, beiug very little soluble in cold water. 

 The precipitate first formed redissolves in its mother-liquor up to the 

 point when only half the barium chloride has been added, but is all 

 again precipitated on adding the rest of the barium chloride and 

 letting the mixture cool. The mother-liquor must be decanted soon 

 and the precipitate drained ou a tile, because the former in about an 

 hour after cooling begins to deposit potassium salt. The results of 

 the an.alysis of the precipitate were — 



* The behaviour of the mixture in g-elatinising and in breaking up then into a thin liquor 

 and a precipitate which became horny on drying, is much like that of one of Fromy's potassium 

 salts, his metasnlpliazate. 



