The Pliospliates of America. 169 



1 c.c. = .01080 gramme Ag. 



' = .01700 " AgNo 3 . 



" = .00355 " Cl. 



" = .00585 " NaCl. 



DECI-NORMAL SODIUM CHLORIDE SOLUTION. 



Dissolve 5.85 grammes of pure sodium chloride, dried by gentle 

 ignition, to one litre. 



1 c.c. = .00585 gramme NaCl. 

 " = .00355 " Cl. 

 " = .01080 " Ag. 



BARIUM CHLORIDE SOLUTION. 



Dissolve 122 grammes of barium chloride, dried between paper 

 to one litre. 



1 c.c. = .0490 gramme H 2 SO 4 . 



" = .0480 " SO 4 . 



" = .0400 " SO 3 . 



" = .1220 " BaCl 2 (2H 2 O). 



" = .1040 " Ba01 2 . 



" = .0685 " Ba. 



STANDARD URANIUM SOLUTION. 



Take about 40 grammes of uranium acetate, dissolve in water ;. 

 add about 25 c.c. of glacial acetic acid, and make up to one litre. 

 This solution is then titrated against the sodium phosphate and 

 diluted until 50 c.c. are equivalent to 50 c.c. of the latter, 



1 c.c. = .002 gramme P 2 O 5 . 



STANDARD SODIUM PHOSPHATE SOLUTION. 



Take 10.085 grammes of pure, crystallized, non-effloresced, di- 

 sodiurn hydrogen phosphate, dried between paper, and dissolve to 

 one litre. Check this solution by evaporating 50 c.c. to dryness- 

 and igniting. The residue should weigh .1874 gramme. 



50 c.c. = .1 gramme P 2 O 5 . 



SODIUM ACETATE SOLUTION. 



Dissolve 100 grammes of the salt in water, add 100 cc. of pure 

 acetic acid (sp. gr. 1.04), and dilute to one litre. Exact quantities 

 are not necessary. 



