SILVER, POTASSIUM, ETC. 55 



From (5) AgCl = 142.303, ± .0066 



From (13) and (F) " =142.276,^.0052 



From (16) " (23) " = 142.063, zh .0168 



From (17) " (20) " = 142.353, ±.0156 



From ( 1 8) " (25) " = 142.306, i .0271 



From (19) " (26) " = 142.278, d= .0105 



General mean ^S^U ;= 142.277, dz .0036 



The third of these values is certainly too low, and although it reduces 

 the atomic weight of chlorine by only 0.01, it ought to be rejected. The 

 general mean of the otlier five values is AgCl = 142.287, ± .0037. Sub- 

 tracting from this the atomic weight of silver, 107.108, ± .0031, we have 

 for the atomic weight of chlorine — 



CI = 35-179, ±.0048. 



For silver bromide three ratios are available: 



From (6) . . AgBr = 186.463, ± .0137 



From (14) and (G) " = 186.450, d= .0050 



From (18) " (24) " = 186.459, ± .0339 



General mean AgBr = 186.452, ± .0054 



Hence, applying the atomic weight of silver as before — 



Br= 79.344, rfc .0062. 



For silver iodide we have — 



From (7") Agl = 232.959, ± .0134 



From (15) and (H) " = 233.008, ±z .0079 



From (19) " (24) " =232.997,^.0153 



General mean Agl ;= 232.996, zfc .0062 



Hence, 



1 = 125.888, ± .0069. 



For the molecular weight of sodium chloride three values appear, as 

 follows : 



From (4) NaCl =: 58.057, =b .0050 



From (8) and (E) .. " = 58.061, zb .0018 



From (16) " AgCl " =58.148,^.0049 



Genera! mean NaCl = 58.069, ± .0016 



Rejecting the third value, which corresponds to the rejected value for 

 AgCl and throws out ratio (IG) entirely, the mean becomes 



NaCl ^ 58. 060, zt .0017 

 From (9) and (.\) NaBr = 102.224, zh .0031 



