The solubility of oxygen in lakes high in the Rocky Mountains is affected by the
ID: 492475 • Letter: T
Question
The solubility of oxygen in lakes high in the Rocky Mountains is affected by the altitude. If the aqueous solubility of atmospheric O_2 is 2.67 times 10^-4 M at sea level and 25 degree C. what is the solubility of O_2 at an elevation of 12,000 ft where the total pressure is 0.657 atm? Assume the temperature is 26 degree C. and that the mole fraction of O_2 in air is 0.209 at both 12,000 ft and at sea level. 1.75 times 10^-4 M 2.67 times 10^-4M 366 times 10^-5 M 4.06 times 10^-4 M 5.58 times 10^-5 MExplanation / Answer
Ans: (a)
William Henry, Henry's law states that at the constant temperature, solubility of a gas in a liquid is directly proportional to the pressure of the gas.
Initial p1 = 1 atm
Initail concentration = c1 = 2.67 × 10–4 M
Final p2 = 0.657 atm
Fconcentration = c2 = ?
p2/p1 = c2 / c1 So, c2 = (2.67 × 10–4 M) (0.657 atm) / 1 atm = 1.75 × 10–4 M.