156 NON-METALLIC ELEMENTS IN BINARY COMPOUNDSUse this as the generating flask A in Fig. 21. Assemble the rest
of the apparatus as shown. Pour 50 cc. of water in the absorp-
tion flask C. The water should seal the bottom of the thistle
tube h but should stand about { inch below the end of the de-
livery tube g. Place 10 cc. of 6N HC1 in the absorption tube D,
and then add enough water to seal the bend. Remove the stopper
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FIG. 21
APPABATUS FOB DISTILLATION OF AMMONIA FROM MAGNESIUM NITRIDE
A = Generating flask. B = Trap to catch solid matter entrained with gas
and steam. C = Absorption flask with pure water in bottom. D = Absorp-
tion tube, bend sealed with dilute acid.
and fittings from the generating flask A. Pour water into the sepa-
ratory funnel i and open the stop cock until the stem of the tube
has filled with water. Replace the stopper in the flask and open
the stop cock to admit a single drop of water. Add another drop
as soon as the reaction subsides, and continue to add a single drop
at a time until the reaction becomes less violent. Finally add
enough water to make 70 cc. Rock the flask until the contents are
thoroughly mixed, then while still rocking it apply a small flame
until the liquid boils. Boil gently for 15 minutes. Pour together