00327
The difference multiplied by 3.6288 gives the weight of sodium chloride
in the mixture. In this case it equals 0.0118 gram. The potassium
chloride is indicated by the difference between this and the weight of
the mixed chlorides. It equals 0.0148 gram. We have now got--
Sodium chloride 0.0118 gram
Potassium chloride 0.0148 "
from 1 gram of the rock taken. Multiplying these by their factors we
have (Soda = 0.0118?0.5302; Potash 0.0148?0.6317)--
Soda = 0.625 per cent.
Potash = 0.935 "
~Concentration of the Alkalies.~--With the exception of magnesia, all
the other bases are separated from the alkalies in the ordinary course
of work without the addition of any re-agent which cannot be removed by
simple evaporation and ignition. Consequently, with substances soluble
in acids, successive treatment of the solution with sulphuretted
hydrogen, ammonia, ammonic sulphide, and ammonic carbonate, filtering,
where necessary, will yield a filtrate containing the whole of the
alkalies with ammonic salts and, perhaps, magnesia.
The filtrate is evaporated in a small porcelain dish, with the addition
of nitric acid towards the finish. It is carried to dryness and ignited.
The residue is taken up with a little water, treated with a few crystals
of oxalic acid, and again evaporated and ignited.
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