American chemical journal . umb and one finger. Thecapacity of the flask B is 400 cc, and it is provided with a rubberstopper having three holes. Through one of these holes passesthe bent glass tube (?, which is connected with the apparatus;through another hole the tip or dropper of the burette, andthrough the third hole the bent end of the chlor-calcium tube tube is filled with pieces of pumice saturated with a strongsolution of natr. hydrate. In estimating the carbonic acid in theair with this apparatus I use a solution of oxalic acid standardisedaccording to Pettenkoffer,^ and a solu
American chemical journal . umb and one finger. Thecapacity of the flask B is 400 cc, and it is provided with a rubberstopper having three holes. Through one of these holes passesthe bent glass tube (?, which is connected with the apparatus;through another hole the tip or dropper of the burette, andthrough the third hole the bent end of the chlor-calcium tube tube is filled with pieces of pumice saturated with a strongsolution of natr. hydrate. In estimating the carbonic acid in theair with this apparatus I use a solution of oxalic acid standardisedaccording to Pettenkoffer,^ and a solution of barium hyd. of one-half the strength of that of PettenkofiTer, thereby avoiding anexcess of barium oxalate which makes the disappearance of the 1 Comptes Rendus 90, 1144. Annalen der Chemie, Suppl. Band 2, 25. 192 Va?i Nilys. red color of the rosolic acid more obscure. grams pureoxalic acid which has neither effloresced nor deliquesced are dis-solved in 1000 cc. distilled water, i cc. of this solution has the. same saturating power as i milligram CO2. About grams purebarium hydr. and .5 gram barium chlor. are dissolved in 1000 If the solution is not clear it should be filtered. The Apparatus for Estimation of Carbonic Acid in the Air. 193 solution should be kept in an aspirator bottle, the stopper of whichis connected with a large chlor-calcium tube having its end bent,and the tube filled with pieces of pumice saturated with a strongsolution of natr. hydrate. In titurating the Ba hydr. solutionwith the solution of oxalic acid, contact with the external air isavoided by employing Pettenkoffers method in filling a flask B may be employed in this tituration. Two or threedrops of an alcohol solution of rosolic acid are introduced into it,the rubber tube g is removed from the end of the apparatus andis connected with a wash-bottle containing a solution of , and a U-shaped tube containing soda-lime. The end ofthe chlor-calcium tube
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Keywords: ., bookcentury1800, bookdecade1870, bookpublisherbalti, bookyear1879
