The concentration of O2 in water required to support aerobic aquatic life is abo

Question

The concentration of O2 in water required to support aerobic aquatic life is about 4.0 mg L-1 (1 L = 1 dm-3). The molar fractions of O2 and N2 in the air are about 0.2 and 0.8, respectively, which remain pretty much constant at different altitudes. Molecular mass of O2 is 32 g/mol. Molecular mass of N2 is 28 g/mol (a) What is the minimum partial pressure of oxygen in the atmosphere that can give O2 concentration of 4.0 3. mg L1 in water? (b) In a lake at very high altitude (4000 m) on the Himalaya, the air pressure could drop down to ½ bar 0.5 atm). What is the partial pressure of oxygen in the air at that altitude? Can aerobic aquatic life be supported in a lake at that altitude! Caxboin dioxide, CO Nitrogen, N2 Oxygen, O2 Henry's law constants for gases dissolved in water at 25°C* KH (bar) 1.7x10 9.0 x10 5.0 x104 *Assume the constants remain unchanged over a large temperature ranges

Explanation / Answer

a) Ans

The partial pressure of oxygen can be calculated by below formula

X = p(O)/KH

p(O) = 0.4 bar

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