Silver carbonate, decomposition, crystal water

A mixture of 150 parts of oxalic acid, 40 of potassium chlorate, and 20 of water is heated to 60°, and the soln. cone, in vacuo at 50° until it begins to crystallize. The cold liquid i3 then treated with 3 volumes of absolute alcohol, when potassium carbonate is precipitated. Fine deliquescent needles of potassium chlorite can be obtained by fractional crystallization in vacuo. The residue gives a further crop of crystals of the chlorite by treatment with 95 per cent, alcohol. Small yellow crystals of silver or lead chlorites can be obtained by double decomposition. 

The foregoing hydrochloride when treated with silver or barium hydroxide only yields triphenylphosphine dihydroxide, (CgPIg)3P(OH)2, but if concentrated aqueous sodium hydroxide or carbonate be used, the free betaine is isolated. It separates from alcohol in tabular crystals, M.pt. 124° to 126° C., which readily dissolve in chloroform or acetic acid, and when heated i ith water give the dihydroxide. It forms a platinicliloride, consisting of long, golden-yellow needles. The decompositions mentioned above are indicated by the following equations —... 

IS obtained by the condensation of triphenylphosphine and ethylene chlorhydrin. It crystallises in glistening wlnte needles, M.pt. 129° to 130° C., readily soluble in water or alcohol, insoluble in ether. Its platinichloride crystallises from dilute alcohol in golden-yellow needles melting with decomposition at 222° to 224° C. Moist silver oxide transforms the hydrochloride to the free base, a viscous liquid which is strongly alkaline and absorbs carbon dioxide from the atmosphere. The hydrobromide forms yellowish-white crystals, M.pt. 114° C., and the hydriodide melts at 185° to 186° C. 

---