NITROGEN. 47 



By the same general process Penny* determined how 

 much potassium nitrate could be formed from 100 parts of 

 chlorate. He found as follows : 



82.505 

 82.497 

 82.498 

 82.500 



Mean, 82. 500, db .0012 



For 100 parts of sodium chlorate he found of nitrate : 



79-875 

 79.882 

 79.890 



Mean, 79.8823, ± .0029 



For the ratio between the chloride and nitrate of sodium 

 Penny made two sets of estimations as in the case of potas- 

 sium salts. The subjoined figures give the amount of 

 nitrate equivalent to 100 parts of chloride : 



First Series.— NaCl treated with HNO^ 



145-415 

 145.408 

 145.420 

 145.424 

 145.410 

 145.418 

 145.420 



MeJin, 145.4164, zb .0015 



Second Series. — NaA'O^ treated with HCl. 



145.419 



145-391 

 145.412 



145-415 

 145.412 

 145.412 



Mean, 145.410, =b .0026 



*PhiI. Trans., 1839. 



