864 Dr. Debus on the Action of Nitric Acid 



The formula C« H« Ca 0* requires— 



111 10000 



To a cold solution of glyoxylate of lime, lime-water was added 

 till it became alkaline. After standing half an hour the white 

 precipitate was filtered off, well washed, and treated with water 

 and carbonic acid. The excess of the latter was removed by 

 boiling. The precipitate now consisted of carbonate and oxalate 

 of lime ; the filtrate from it yielded, after evaporation, crystals 

 of glyoxylate of lime. 



0-185 grm., dried in vacuo, gave 0*085 carbonate of lime, or — 



18-3 per cent, of calcium. 

 The formula C« H^ Ca 0* requires— 



18*01 per cent, of calcium. 



The filtrate from the precipitate by lime-water was also freed 

 from its excess of lime by CO* and then evaporated ; crystals of 

 glycolate of lime were obtained. 



0-162 grm., dried in vacuo, lost at 100° C. 0'035 water. The 

 same quantity, dissolved and precipitated by oxalate of ammonia, 

 gave 0-066 Ca* CO^. Or in 100 parts,— 



Water ..... 216 

 Calcium .... 16-2 



The formula 2(0* H^ CaO^) + SH* O requires— 



Water 221 



Calcium .... 16-3 



A solution of glyoxylate of lime, made alkaline with lime-water 

 and boiled for a short time, was decomposed into glycolate of 

 lime and oxalate of lime. The same result was obtained when 

 the cold mixture was allowed to stand a few days. Consequently, 

 when lime-water is added to a cold solution of glyoxylate of lime, 

 the latter combines with more lime and forms an almost inso- 

 luble substance. Slowly at common, but very fast at a high 

 temperature, this compound resolves itself into glycolate and 

 oxalate of lime and water, — 



2C«H3CaO* + CaHO = C«Ca2 0* + C«HSCa03-{-2(HHO). 



Sometimes I obtained the glyoxylate of lime crystallized, not 

 in prisms, but in long needles. As the appearance of both was 

 very different, I thought it necessary to examine them more 

 minutely. 



