^QQ ACCOUNT OF CERIUM. 



With Tartareous Acid, 



Tartrite of cc- (L.) Free tartareous acid has no aSion on muriate of 

 """*• cerium. The recently precipitated oxide unites with this 



acid by digeftion, and yields a tartrite of cerium, which 

 diflblves readily in water. This fait is alfo precipitated from 

 faturated folutions by tartrite of potafh. Like the oxi- 

 late of cerium, it diflblves in pure ammonia, but does not 

 cryftallize. 



Tartrite of cerium is not entirely foluble in water; the folu- 

 tion is precipitated by carbonate of foda. 



With Benzoic Acid, 

 Bcnzoatc of cc- (M.) This acid does nota6l on the muriate of cerium; but, 

 rium. by digeftion, well concentrated benzoic acid diflblves the oxide 



of cerium recently precipitated. On cooling, the folution firft 

 depofits cryftals of the acid in excefs, and afterwards ben^ 

 zoate of cerium in the form of a white powder, which adheres 

 to the cryflals of benzoic acid. 



The refinous matter with which this acid is frequently united, 

 combines with the benzoate of cerium, and forms an infoluble 

 brown powder. 



With Citric Acid. 



Citrate and acU C^-) Muriate of cerium is not precipitated by citric acid. 



dulous citrate of g^t the oxide digfefted with citric acid forms an infoluble fatu- 



cerium. rated combination, which an excefs of acid diflTolves. The 



acidulous citrate of cerium is of a yellow colour and does not 



cryftallize. Alcohol deprives it of its water, and of part of 



its acid, but does not diirolve it. 



With' Acetic Acid, 



(O.) The calcined oxide of cerium js only very imperfe6tly 

 difiblved in acetic acid, even with the afliftance of heat; but 

 that which is recently precipitated by the alkalies, is diflblved 

 with facility. The faturated acetate of cerium is foluble in 

 water ; it has a fweet tafte, and gives granulated cryftals, by 

 evaporation, which do not change in the air, ahd are but 

 flightly foluble in alcohol. 



This fait fwells in the fire, and is deftroyed, 



(To be continued.) 



SCIENTIFIC 



Acetate of ce- 

 rium. 



