78 



E. DIVERS AXD T. HAGA. 



solution evaporated on the Avater-hath gives off ammonia and leaves a 

 crystalline residue, which may be taken to be a compound or mixture 

 of the salts CaAmXS.O^ and CaliNSoO^. Treated with water some 

 nearlv insoluble calcium oximidosulphonate is left, while tlie greater 

 part of the mass dissolves up as calcium ammonium salt. 



If after dissolving, as described in the preceding paragraph, two 

 mois, of calcium hydroxide in two mois, of the ammonium salt, a 

 third mol. of the softest moist calcium hydroxide l^e stirred in, it may 

 be seen to give place to a voluminous precipitate which most probably 

 is normal calcium oximidosulphonate. The precipitate has very little 

 solubility in water, and is so free from ammonia as to evolve none 

 when mixed witli calcium hydroxide, a test however which is not 

 (juite conclusive. 



Lead oximidof^idplioiiaies. 



Reactions of allrdi o.riiuidosulplionales trith lead acetates. — The 

 relictions of oximidosulphonates with lead salts are complex. The 

 disodium arid dipotassium sadts give no precipitate with normal lead 

 acetate, l)ut precipitate with the basic lend acetates. With highly 

 basic acetates in good excess the precipitate is mainly or wholly the 

 normal hydroxy-lead salt (numbered 2 in the description of these salts 

 which follows). With a basic acetate not in excess and in solution 

 not concentrated, the ]n'ecipitate is the salt numbered 3 ; while with 

 medium quantities of basic acetate and concentrated solutions the pre- 

 ci[»itate is approximately the salt 4. The precipitates usually contain, 

 especially when strong solutions are worked with, acetate and alkali 

 salt, only partially removable l)y washing with hot water. 



Normal sodium oximidosulphonate and normal lead acetate show 

 no immediate precipitation unless the solutions are dilute. AVith 

 enough of the sodium salt present, two mois, or inore, to one mol. of 



