The ammoniacal liquor
was of uniform strength throughout all the experiments, being kept in
a corked jar; and the solution of sulphate of ammonia was passed
through filter paper before being crystallized. Thus we obtained a
white salt. In each experiment the solution of sulphate was divided
into four equal parts by weight, and one part filtered and
crystallized to dryness over a spirit lamp; the weight in each
experiment being as nearly as possible the same, or 31/4 oz. of salt to
2 oz. of acid--being in the proportion of 26 oz. of sulphate to 1 lb.
of acid, or 321/2 cwt. of salts to 20 cwt. of acid.
The results surprised me; and being uniform over a number of
experiments, pleased me. Still, I preserved the character of a critic
and said: "I should like to treat 8 oz. of acid in the ordinary
way--saturating it with ammoniacal liquor, and then crystallizing it."
"Oh!" Mr. Croll said, "we know what that will produce." I replied:
"Yes; but I would like to do it with the precise acid and liquor we
have been using, so that we may have the experiment on all fours with
yours, barring your process.
Pages:
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107