ACTIVE REACTION OF THE ENVIRONMENT

From Big Medical Encyclopedia

ACTIVE REACTION OF THE ENVIRONMENT — the reaction of the environment determined by concentration (more precisely activity) hydrogen ions of N + (actual acidity) or hydroxylic ions IT - (active alkalinity), contained in this environment. Speed and the directions of the biochemical processes which are the cornerstone of life activity of an organism are depending on And. river of page (see. Buffer systems , Water salt metabolism , Acid-base equilibrium ).

And. the river of page can be characterized by a negative decimal logarithm of concentration of hydrogen ions rn (see. Hydrogen ion exponent ). For the quantitative characteristic And. rubles of page use an empirical scale rn. For creation of this scale and for calibration of the electrodes serving for measurement rn a number of solutions with precisely setpoint values rn is offered. Especially suitable for this purpose were five standard solutions offered National bureaus of standards of the USA. The table of values rn these solutions is given at various temperatures above. In solution of acid potassium tartrate the mold therefore it is recommended to be applied freshly cooked is easily formed. Other solutions do not change within about two months.

Change of values rn standard solutions depending on temperature { | class = "wikitable sortable" |- ! Temperature !! 0,05 M KN solution 3 • (With 2 About 4 ) 2 • 2H 2 About (salt of sorrel)!! Solution of the acid potassium tartrate sated at t ° 25 °!! 0,05 M of solution of acid ftalevokisly potassium!! 0,025 M of KN 2 PO 4 + Na 2 HPO 4  !! 0,01 M of solution of borax | - | 0 | | 1,67 | | -| | 4,01 | | 6,98 | | 9,46 | - | 5 | | 1,67 | | -| | 4,01 | | 6,95 | | 9,39 | - | 10 | | 1,67 | | -| | 4,00 | | 6,92 | | 9,33 | - | 15 | | 1,67 | | -| | 4,00 | | 6,90 | | 9,27 | - | 20 | | 1,68 | | -| | 4,00 | | 6,88 | | 9,22 | - | 25 | | 1,68 | | 3,56 | | 4,01 | | 6,86 | | 9,18 | - | 30 | | 1,69 | | 3,55 | | 4,01 | | 6,85 | | 9,14 | - | 35 | | 1,69 | | 3,55 | | 4,02 | | 6,84 | | 9,10 | - | 40 | | 1,70 | | 3,54 | | 4,03 | | 6,84 | | 9,07 | - | 45 | | 1,70 | | 3,55 | | 4,04 | | 6,83 | | 9,04 | - | 50 | | 1,71 | | 3,55 | | 4,06 | | 6,83 | | 9,01 | - | 55 | | 1,72 | | 3,56 | | 4,08 | | 6,84 | | 8,99 | - | 60 | | 1,73 | | 3,57 | | 4,10 | | 6,84 | | 8,96 | - | 70 | | -| | 3,59 | | 4,12 | | 6,85 | | 8,92 | - | 80 | | -| | 3,61 | | 4,16 | | 6,86 | | 8,88 | - | 90 | | -| | 3,64 | | 4,20 | | 6,86 | | 8,85 | - | 95 | | -| | 3,65 | | 4,22 | | 6,87 | | 8,83 | } See also Alkalosis . Acidosis , Buffered solutions , Solutions , Electrolytes , Electrodes .

Bibliography: Bates R. G. Definition rn, the theory and practice, the lane with English, L., 1968; Schwab K. Bases of the technology of measurement rn, the lane with it., M., 1962.

V. P. Mishin.

Яндекс.Метрика