Chemical lecture experiments . ution ofammonium chloride. The sodium amalgam, when kneadedwith the fingers in the ammonium chloride solution, whichit rapidly attacks, swells up and forms a butterlike mass,which is porous and rapidly decomposes. Sodium amalgam ; saturated NH4C1 solution. 2. Preparation of ammonium amalgam by the electrolysisof a solution of ammonium sulphate.—By the electrolysis of ammonium sulphate free ammonium isliberated at the negative pole, and if anelectrode of mercury is used, the ammoniumamalgamates with it, forming ammoniumamalgam. A saturated solution of ammonium sul
Chemical lecture experiments . ution ofammonium chloride. The sodium amalgam, when kneadedwith the fingers in the ammonium chloride solution, whichit rapidly attacks, swells up and forms a butterlike mass,which is porous and rapidly decomposes. Sodium amalgam ; saturated NH4C1 solution. 2. Preparation of ammonium amalgam by the electrolysisof a solution of ammonium sulphate.—By the electrolysis of ammonium sulphate free ammonium isliberated at the negative pole, and if anelectrode of mercury is used, the ammoniumamalgamates with it, forming ammoniumamalgam. A saturated solution of ammonium sulphateis placed in a 150 cc. cylinder having a 2 of mercury on the bottom (Fig. 150). Awell-insulated copper wire is thrust into thesolution and the bare end pressed under themercury. The positive electrode should con-sist of a small piece of platinum. On pass-ing a current from 4 cells of a bichromate battery through the solution the decomposition is effected. The mercury at the bottom of the cylinder swells up with. Fig. 150 AMMONIUM COMPOUNDS 359 the formation of ammonium amalgam, and care should betaken to stop the current before the mercury has reachedthe platinum electrode. A piece of ordinary annunciatorwire which is well covered with paraffin will serve as aconductor to the mercury electrode. Battery ; 150 cc. cylinder; annunciator wire ; Pt electrode ; Hg ;(NH4)2S04 saturated solution. 3. Union of ammonia and hydrochloric acid to form ammo-nium chloride. — (a) A liter cylinder is filled with hydro-chloric acid gas either by downward displacement or byshaking 5 cc. of concentrated hydrochloric acid about in itfor a few minutes, and is then covered with a glass brush such as is used for cleaning lamp chimneys isdrenched with strongest ammonium hydroxide, and plungedsuddenly into the jar of hydrochloric acid. A piece of card-board large enough to cover the jar may be slipped over thebrush handle and the brush suspended in the middle of thejar, the glas
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