Absorber

Bunsen Absorption Meter

An absorptiometer - invented in the 19th century by German chemist Robert Wilhelm Bunsen , a measuring device used to determine the dissolution coefficients of gases in liquids .

The main parts of the absorber are (see figure): measuring tube c, iron stand f and open glass cylinder g at both ends. Tube c divided by mm ; at the end of it is attached a mastic screw thread b with nut a (Fig. 2), the surface of which, facing the tube, is covered with rubber . This makes it possible, by tightening nut a, to seal the tube c. On the nut a, there are protrusions with, which correspond to the cutouts in the stand f. The cylinder g (Fig. 1) during the experiment is filled with water and serves to maintain a certain temperature in the tube c, which is indicated by the thermometer k.

The cylinder g is pressed from above to the stand f by the ring h with screws i; for tightness, a rubber ring is placed on the surface of the stand f. From above, the cylinder g is tightly closed by the cover p, the latter pressing the measuring tube c. With the device assembled, the experiment is performed in this way. Filling the tube with the given gas in the usual way and measuring its volume , temperature and pressure , introduce a certain volume of the test fluid (devoid of air ) into it, screw the nut a and insert it into the stand f. Then the cylinder g is strengthened, a little mercury is poured into it, then to the top of the water, the lid p is closed and the entire device is shaken several times to saturate the taken liquid with gas. After that, having opened the cover p, the tube c is unscrewed a little, and the mercury from the cylinder g enters the tube due to a decrease in gas pressure; screw the tube again and shake the device, repeating this until the level of mercury in the tube c stops changing. Having determined the height of the mercury level in the tube c and in the cylinder g, the height of the water column, its temperature and the height of the barometer , all the data for calculating the absorbed amount of gas are obtained. The rr tube with a funnel and faucet connected to the f stand makes it possible to pour mercury into the device or to discharge it from the device.