86 



E. DIVERS AND T. HAGA ; OXIMIDOSULPHOXATES. 



cipitated from a known (juantity of normal sodium oximidosulphonate, 

 waslied bv décantation, and its last wasliing-water closely decanted. 

 The precipitate even on long standing still occupies a large volume of 

 ]i(|uid, and if to it there is now added ])OW(l('red ammonium liydrogen 

 carbonate in cjuantitv calcuhited to decompo.se completely barely two- 

 thirds of the lead salt and the mixture is well agitated and then left 

 to stand, lead carbonate, filling a very small space, settles down and a 

 clear mother-licpior can be decanted having only a scarcely noticeable 

 odour of anunonia and containing one atom of lead to two of ammo- 

 nium, practically all tlie oximidosulphonic radic:d, and no carbonic 

 arid. Much water added renders it milky. It can be evaporated to 

 dryness in the cold and the residue redissolved in water. 



I'he disodium and dipotassium liydroxy-lead salts cannot be 

 prepared in a similar wav. but a solution of either of these salts, or of 

 the diammoniutn salt, along with acetate, is apparently obtained by 

 mixing too-ether in concentrated solution one mol. of hemihydroxy- 

 lead acetate nnd one mol. of n(n*mal oximidosulphonate of sodium, 

 potassium, or ammonium. The solution dries up to a vitreous mass 

 with a little confnsed crystalline matter, and is precipitated on 

 dilution with water. 



