78 On the Synthesis of Tribasic Acids. [Feb. 16, 



It is a colourless liquid, is slightly soluble in water, and has an acrid taste. 

 Heated with solid potash it suffers decomposition, alcohol being formed and 

 the acid regenerated. 



Tricarballylic Amylic Ether, 9 f 1 ? H A?" 1 O 6 . 



WlO -"-11/3 J 



This body is formed when dry hydrochloric acid gas is passed into a 

 mixture of one part by weight of tricarballylic acid and two parts of pure 

 amylic alcohol maintained at the temperature of boiling water. The pro- 

 duct may be partially purified by heating it in a retort till 200 C., and 

 then dissolving it successively in alcohol and in ether. It is a thick oily 

 liquid, is heavier than water, and has an acrid taste. Its boiling-point is 

 beyond the range of the mercurial thermometer. Heated with solid potash, 

 it is resolved into amylic alcohol and tricarballylic acid. 



C 12 H 5 6 '" 

 Glyceri-tricarballylate of Baryta, C 6 H 7 O 4 ' 



Ba 2 



This salt was prepared by maintaining for several hours at the tempera- 

 ture of 200 C. in a sealed tube a mixture of one part of tricarballylic acid 

 and two parts of pure glycerine. The product was neutralized by a solu- 

 tion of baryta, evaporated to dryness, and digested with absolute alcohol to 

 remove the uncombined glycerine. A buff-coloured powder was thus ob- 

 tained having, I have no doubt, the composition expressed by the above 

 formula, although my analyses do not correspond very well with it. The 

 acid combined with the baryta is bibasic, and is represented by the formula 



Soda-salts of Tricarballylic Acid. 



The soda-salts of this acid are very soluble in water and difficult to crys- 

 tallize. Three salts may, I believe, be found, containing respectively one, 

 two, and three equivalents of sodium. One equivalent of the acid I 

 fpund required for complete neutralization exactly three equivalents of pure 

 carbonate of soda. The composition of the salt with two equivalents of 



C 12 H 5 6 '"1 

 sodium which I obtained in crystals is probably Na 2 > O 6 + 4HO. 



H J 



Tricarballylate of Lime, 12 C 3 G [ O + 4HO. 



When a solution of this acid is neutralized with lime-water and evaporated, 

 a white amorphous powder separates, which is the salt in question. It is 

 sparingly soluble in water, and freely soluble in dilute acids. 



Tricarballylate of Copper, 12 /v 5 a / O 6 . 

 ou 3 j 



This salt falls in the form of a beautiful bluish-green powder when sul- 



