Talk:Oxygen solubility
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Numerical examples for oxygen solubility and the activity of dissolved oxygen
- The numerical examples include the following constants:
- (c) The volume fraction of oxygen in dry air is constant at 0.20946.
- (d) The saturation water vapour pressure at 25 Β°C is 3.17 kPa. The partial pressure of oxygen in water vapour saturated air at 25 Β°C and barometric pressure of 100 kPa is (100-3.17)Β·0.20946 = 20.28 kPa. The oxygen solubility in pure water at 25 Β°C is 12.56 Β΅M/kPa.
- (e) The saturation water vapour pressure at 37 Β°C is 6.27 kPa. The partial pressure of oxygen in water vapour saturated air at 37 Β°C and barometric pressure of 100 kPa is (100-6.27)Β·0.20946 = 19.63 kPa. The oxygen solubility in pure water at 37 Β°C is 10.56 Β΅M/kPa.
- (f) The oxygen solubility factor of the medium MiR05 relative to pure water is 0.92 at 25 Β°C and 37 Β°C.
- The numerical examples include the following constants:
- An aqueous solution of pure water in equilibrium with air at standard barometric pressure (100 kPa) is heated from 25 Β°C to 37 Β°C, maintaining equlibrium between the aqueous and gaseous phase. The concentration of dissolved oxygen changes from 254.7 Β΅M at 25 Β°C to 207.3 Β΅M at 37 Β°C. The partial pressure of oxygen changes from 20.3 to 19.6 kPa. The relative activity of oxygen is 20.3 and 19.6, corresponding to the specific activity in the pressure format [20.3 to 19.6 kPa] or the specific activity in the concentration format (20.3 to 19.6 Β΅M].
- An aqueous solution of pure water in equilibrium with air at standard barometric pressure (100 kPa) changed from pure water to a physiological salt solution (MiR05) at 37 Β°C. The concentration of dissolved oxygen changes from 207.3 Β΅M in pure water to 190.7 Β΅M in MiR05. The partial pressure of oxygen remains constant at 19.6 kPa. Therefore, the relative activity of oxygen is 19.6, corresponding to the specific activity in the pressure format [19.6 kPa] or the specific activity in the concentration format (19.6 Β΅M] in both media maintaining equilibrium with the gas phase.
- An aqueous solution (MiR05) in equilibrium with air at standard barometric pressure (100 kPa) and 25 Β°C is heated in a closed system from the initial temperature of 25 Β°C to 37 Β°C. The concentration remains constant at 234.4 Β΅M, since oxygen cannot be exchanged across the boundaries of the closed system. The partial pressure of oxygen is initially 20.3 kPa at 25 Β°C (234.4/11.56). The partial pressure increases upon heating to 37 Β°C in the closed system to 24.1 kPa (234.4/9.72). The relative activity of the gases in solution leads increases to >100 kPa, which leads to gas bubble formation, if the closed system is maintained at constant barometric pressure, as is the case in a respirometer with a chamber that is closed by a stopper with a titration capillary (through which the barometric pressure is kept constant).
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