OP ARTS AND SCIENCES. 217 



m. 



24.00 



I. 0.3068 grm. of the anhydrous salt gave 0.1378 grm. BaS0 4 . 

 II. 0.3128 grm. of the anhydrous salt gave 0.1409 grm. BaS0 4 . 



Calculated for Found. 



Ba(C 5 H 3 SO G ) 2 . I. II. 



Ba 26.39 26.41 26.48 



Calcic (3-SuIp7iopyromucate, CaC^H o S0 G . 2 H 2 0. — The calcium 

 6alt is quite readily soluble in cold water, and separates on evapora- 

 tion in crusts. By the addition of alcohol to a cold aqueous solution 

 the salt is precipitated in the form of small prisms, which, when dried 

 by exposure to the air, contain two molecules of water. 



I. 1.0454 grm. of the air-dried salt lost, at 130°, 0.1444 grm. H 2 0. 

 II. 1.0285 grm. of the air-dried salt lost, at 135°, 0.1415 grm. H 2 0. 



H 2 



I. 0.4790 grm. of the anhydrous salt gave 0.2825 grm. CaS0 4 . 

 II. 0.4118 grm. of the anhydrous salt gave 0.2425 grm. CaS0 4 . 



Calculated for Found. 



CaC 5 lI 2 SO G . I. II. 



Ca 17.40 17.35 17.32 



Potassic fi-Sulphopyromiicate, K 2 C 5 HSO fi . 2^ H 2 0. — The potas- 

 sium salt is extremely soluble in water, and crystallizes in long prisms. 

 It separates in the form of fine needles on the addition of alcohol to its 

 aqueous solution. 



1.2358 grm. of the air-dried salt lost, at 140°, 0.1788 grm. H 2 0. 



H 2 



I. 0.4028 grm. of the salt dried at 140° gave 0.2601 grm. K 2 S0 4 . 

 II. 0.4120 grm. of the salt dried at 140° gave 0.2665 grm. K 2 S0 4 . 



Calculated for Found. 



K 2 C 5 H,S0 6 . I. II. 



K 2 29.16 28.99 29.04 



