2^6 New Tiihltcationi, 



being contaminated by that metal ; and if a Icnden worin be 

 ufcd for its x:onden{iUion, fomc portion of lc;id will certainly 

 be difTolved. The former metal will appear on adding an 

 cxccfs of folution of amnionia; and lead will be detected by 

 jthc fulphurated ammonia^ or by water faturatcd with fulphur- 

 at^jd hydrogen. 



. ** It is pot uniifual, in order to incrcafe the acid taftc of 

 vinegar, to add fulphnric acid. This acid may be immedi- 

 ately difcovercd by folutions of barytas, which, when vinegar 

 has been thusadultcratpd, throw down a white precipitate." 



" . Ci^rhonat of Toinjh — Kali Treparatumy P. L. 



** The Ailt of tartar of the {l)ops generally contains fidphat 

 find muriat of potaili, and filiceoiis and calcareous earths. It 

 should diflTolve entirely, if pure, in twice it§ weight of cold 

 water; and any thing that remains undiffolyed may be re?. 

 garded as an impurity. Sometimes one-fourth of foreign 

 admixtures may tluis be dptefted, the greater part of whicl^ 

 IS fulphat of potafli. To afpertain the nature of the adullera^ 

 tion,, diflblve a poriion in pure and diluted nitric acid. The 

 filiceous earth only will remain undiflblvpd. Add, to one 

 pprlion of the fqlution, nitrat of barytes. This will detect 

 fiilphat of pqtafh by a copious precipitate. To another por- 

 tion add nitrat of filveir, whjch will difcover muriatic faltsj; 

 and, to a third, oxalat of ammonia, which will det^i^ calca- 

 reous earth. 



'f The fqlution of carbonat of potaili (Aqua Kali_j P. L.) 

 ijHay be examined in a firnilar manner. 



'^ Solution, of pure Fota/lp—^Aqjta Kali Purr, P. L. 



^' This may be affayed for fulphuric and muriatic falts by 

 faturation \yith nitric acid, and by the tefts recommended iu 

 fpcaking of carbonat of potaOi. -A perfeftly pure folution of 

 potadi flaouild remain traiifparent, on the addition of barytic 

 water. If a precipitate fliould cnfue, which didblves, with 

 efliirvefccnce, in dilute muriatic acid, it is owing to the pre- 

 fence of carbonic -acid j if the precipitate is not foluble, it in- 

 dicates fulphuric acid, A redundancy of carbonic acid i$ 

 alfo fhown. by an efiervcfccnce on adding diluted fulphuric 



acici i 



