44
Lime 10.55
Ferric oxide 0.01
Silica 0.30
Sulphuric oxide 3.69
Nitrogen pentoxide 0.11
Carbon dioxide 8.38
Chlorine 1.70
Volatile and organic matter 0.66
-----
29.23
Less oxygen equivalent to chlorine found 0.39
-----
28.84
For the preparation of distilled water, the apparatus shown in fig. 64
is convenient for laboratory use. It consists of a copper retort heated
by a ring gas-burner, and connected with a worm-condenser.
[Illustration: FIG. 64]
PRACTICAL EXERCISE.
A mineral, on analysis, gave the following results:--Water, 44.94 per
cent.; sulphuric oxide, 28.72 per cent.; ferrous iron, 13.92 per cent.;
ferric iron, 0.35 per cent.; copper, 6.1 per cent. The mineral was
soluble in water, and showed nothing else on testing. How would you
report the analysis? Calculate the formula for the salt.
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