310 



PROCEEDINGS OP THE AMERICAN ACADEMY 



of a solution of plumbic acetate, which precipitated plumbic bromide 

 and sulphite ; after these had been removed by filtration an excess of 

 plumbic acetate threw down the lead salt of the sulphoacid, which 

 was purified by recrystallization from water, and then decomposed 

 with sulphuretted hydrogen; the nitrate from the plumbic sulphide 

 was concentrated by evaporation, and the solution of parachlorbenzyl- 

 sulpb.oac.id thus obtained used in the preparation of the following 

 salts. 



The Barium Salt, (C 6 H 4 ClCH 2 S0 8 ) 2 Ba . 2M 2 0, was made by boiling 

 the acid with pure baric carbonate. It can also be prepared by the 

 addition of baric chloride to the sodium salt, but in this case it was 

 found hard to free it from the excess of baric chloride. 



0.9290 gr. of the salt dried in vacuo lost when heated to 160° 

 0.0565 gr. 



0.5408 gr. lost 0.0332 gr. 



Calculated for (C 7 II 6 ClS0 3 ) 2 Ba . 2II 2 Found. 



Water 6.16 6.08 6.12 



0.1575 gr. of the salt dried at 160° gave, after precipitation with 

 dilute H.,S0 4 , 0.0680 gr. of BaS0 4 . 

 0.4620 gr. gave 0.1995 gr. BaS0 4 . 



Calculated for (C 7 H 6 ClS0 3 > 2 Ba. 

 Barium 25.00 



Found. 

 25.38 25.39 



It crystallizes from water in radiated bunches of white needles 

 which are moderately soluble in water. 



The Calcium Salt, (C fi H 4 ClCH 2 S0 3 ) 2 Ca. 7II 2 0, was made by warm- 

 ing the aqueous solution of the acid with calcic carbonate, filtering 

 and allowing the concentrated filtrate to evaporate spontaneously ; it 

 was purified by recrystallization from water. 



0.5805 gr. of the air-dried salt lost in vacuo 0.1033 gr. ; when 

 heated to 160°, 0.0332 gr. ; making in all 0.1365 gr. 



0.9536 gr. lost in vacuo 0.1506 gr. ; when heated to 160°, 0.0552 

 gr. ; making in all 0.2058 gr. 



Calculated for (C 7 H 6 ClS0 8 ) 2 Ca . 7H 2 0. 

 Water 21.84 



Found. 

 23.51 21.58 



Calculated for (C 7 H c ClS0 8 ) 2 Ca. 2H 2 0. 

 Water 7.39 



Found. 

 6.96 6.87 



