OBSERVATIONS ON BKNZOIN. 85 



4. Nitric acid produces a violent effervefcence when poured Efiefts 9* ftiJW 



, , . . , , ,/- , • , n ■ a"d on benzoin. 



upon powdered benzoin, the ballam being at the lame time 

 converted into an orange coloured mafs. 



Six ounces of nitrous acid, of the fpecific gravity of 1.36 Solution. 

 being poured on one hundred grains of very pure benzoin re- 

 duced into powder, the mixture being gradually heated in a 

 fancl bath till it boils, a folution of a light yellow colour is 

 formed. The folution thus obtained, depofits a fmall quantity Separation of 

 of benzoic acid, as it cools : this quantity gradually increafcs, trom 

 till after fome days, the whole of the benzoic acid appear* to 

 have been feparated. 



This fa£t was firft obferved by Gottling; he does not how- fifft obferved by 

 ever feem to have obferved that the whole of the balfam is fo- ° mfi * 

 luble in nitric acid. 



A. When the above folution, recently made, is poured into Effe & of water 



, . . . • • . i i ii on £ be nitric 



water, the benzoin is precipitated, apparently unaltered. folution 



B. Sulphuric acid caufes no alteration in this folution. of fulphuric 



C. Muriatic acid forms a white precipitate which is re- \\ ^ ur jaf{ c 

 diffolved on the application of heat, forming a bright yellow acid - 

 liquid, which is a folution of benzoin in nitro-muriatic acid, Sol. of benzoin 

 and in which no precipitate is formed either by water or the j£.™ tr0 " munttl « 

 alcalies. Its colour is converted into dark brown, when ex- EfT'efts of water 

 cefs of potato is added. ^theriro-'" 



5. When fulphuric acid is poured on pulverifed benzoin, an mur . folution, 



effervefcence takes place; part of the benzoin is diflblved : £ffe ^ s of fnl " 

 r • i i i- • i j . i r • i /- . phunc acid &o 



forming a deep red liquid, and at the lame time a coaly lub- benzoin. 



fiance remains on the furface. Sulphureous acid gas is difen- 



gaged during the folution. 



A. The alcalies form no precipitate in this folution, till after Effe ^ s of tn f 

 fome hours flanding.when a dark coloured precipitate is formed, folution 



B. Water produces a lilac precipitate in the recent folution. oi water. 



6. Neither muriatic nor acetous acids have any effeft on Effefts of mu. 



benzoin. riatic and ace- 



tous acids on 



7. Acetic acid diflblves benzoin, even in the cold. The benzoin, 

 folution formed by the afliftance of heat becomes very turbid of acetIC aCld * 

 on cooling, owing to the feparation of the benzoic acid. 



A. The alcalies form a white precipitate in this folution.— Effefts of the 

 The precipitate formed in the alcoholic folution, (page 1 1 ) ^^n™ * S 

 is re-diflblved after fome hours ftanding. 



8. Acetic ether diflblves benzoin, without the afliftance of Effeds °f acetic 



ether on ben- 

 neat. zoin , 



9. When 



