52 
The precipitate was thoroughly washed till the washings 
were absolutely free from chlorine, and transferred, together 
with the filter paper, to a retort containing a solution of 
caustic soda, which had been freed from ammonia by pro- 
longed boiling. The retort was connected with a condenser, 
the contents of the retort boiled, and the distillate 
“ nesslerised” in successive portions. The result is appended : 
Wt. Fe. NH„ estimated Calc, as Note. 
taken. in distillate. NH 4 C1. 500 cc. boiling distilled water em- 
n -2265 -00054 .0017 ployed in washing the ppt. of 
oxide. 
Determinations were then made in which other alkaline 
salts were substituted for sodium chloride : 
1— 1 
Wt. Fe 
taken. 
•160 
Salt added, 
grm. 
LiCl. 0-25 
Wt. Fe. 
found. 
•1603 
Error. 
•0003 
Notes. 
The isolated impurity was examined 
with the spectroscope, which 
showed strong Li line. 
S'- 
•2165 
Na 2 $o 4 
•2191 
•0026 
Washings gave H 2 S0 4 reaction 
after all HC1 removed. 500 cc. 
employed. 
r. 
•206 
kno 3 
•2097 
•0037 
Wash water=325 cc. ppt. in boiling 
solution. 
s. 
•182 
kno 3 
•1866 
.0046 
Wash water =650 cc. pptd. in cold 
solution. 
Having thus sufficiently investigated the adhesive action 
of ferric hydrate upon salts of the alkalies in solution, 
determinations were made in which salts of the alkaline 
earths were substituted for the former. For these experi- 
ments it was necessary to employ ammonia free from 
carbonate, which was prepared by agitating the ordinary 
solution with lime in a closed flask and filtering just prior 
to use. Care was taken to add the reagent in but very 
V. 
V. 
. excess. Tne followin 
Wt. Fe. 
Wt, Fe. 
taken. 
Salt added. 
found. 
•173 
CaCl 2 
•1786 
•192 
CaCl 2 
•2052 
Error. 
Notes. 
water =330 cc. 
= 650cc. 
Similar results were obtained in presence of barium 
chloride. I may mention that by employing an ordinary 
laboratory solution of ammonia the error on T52grm. Fe 
(precipitated in hot solution) amounted to -0072, and on 
•2313 (precipitated in cold solution) to *0196 grm. These 
