A college text-book of chemistry . stallized boric acid, boron phosphate, BP04,is formed. This compound is characterized by greatstability. Concentrated acids, for example, do not decom-pose it. It also forms a salt which appears to be analogousto tartar emetic, which, as has been pointed out, is prob-ably antimonyl potassium tartrate, C4H406 -j -g . This is the salt represented by the formula 04H4O \ -g- , whichmay be called boryl potassium tartrate. EXPERIMENTS WITH PHOSPHORIC ACID, ETC. 343 Nitrogen Boride, BN\—This compound has been referredto in connection with the preparation of boron. I
A college text-book of chemistry . stallized boric acid, boron phosphate, BP04,is formed. This compound is characterized by greatstability. Concentrated acids, for example, do not decom-pose it. It also forms a salt which appears to be analogousto tartar emetic, which, as has been pointed out, is prob-ably antimonyl potassium tartrate, C4H406 -j -g . This is the salt represented by the formula 04H4O \ -g- , whichmay be called boryl potassium tartrate. EXPERIMENTS WITH PHOSPHORIC ACID, ETC. 343 Nitrogen Boride, BN\—This compound has been referredto in connection with the preparation of boron. It iseasily obtained by igniting a mixture of dehydrated boraxand ammonium chloride. It forms a white powder, whichis insoluble in water, and is characterized by great red heat it is decomposed by water-vapor into ammoniaand boric acid: 2BN + 6H20 = 2B(OH)s + 2NH8. 161.—In a flask connected with an inverted con-denser, as shown in Fig. 63, boil 10 to 15 grams of ordinary phos-. Fio. 63. phorus with 250 cc. ordinary commercial nitric acid. If neces-sary, add more acid after a time. Boil gently until the phos-phorus disappears. Evaporate the solution to complete dryness,so as to get rid of all the nitric acid. Experiment 162.—Try the action of a solution of ordinarysodium phosphate on a solution of silver nitrate. Heat a little ofthe phosphate in a porcelain crucible to redness. After cooling,try the action of the salt left in the crucible on silver nitrate. Arsenic 163.—Pass chlorine into water containing arsenictrioxide in suspension, until the oxide is dissolved. Evaporate to 344 COLLEGE CHEMISTRY. crystallization. Into a dilute solution of the product thus ob-tained, to which some hydrochloric acid is added, pass hydrogensulphide. Explain the changes. E eduction of Arsenic Trioxidb. Experiment 164.—In the bottom of a dry tube of hard glass ofthe form represented in Fig. 64 put a minute piece of arsen
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