Question

CO2 is fairly soluble in water, unlike O2, which is not very soluble.

a. Calculate the solubility of CO2 in water at 20°C and 3.00 atm, given that the solubility of CO2 is 0.348 g/100 mL at NTP.

b. Caclulate the solubility of O2 in water at 20°C and 1150 mm Hg given that the solubility of O2 is 0.00412 g/100 mL at NTP.

c. What are the solubilities of CO2 and O2 in a lake in the mountains (elevation 6200 ft) with a water temperature of 20°C? Atmospheric pressure (Patm, in Pascals) is related to elevation (h, in metres) by the following equation:

Patm = 101325[1 – (2.25577 × 10^-5)h]^5.25588

Answer 1

Answer.

The solubility of a gas is proportional to the pressure of the gas above the liquid.

Solubility × pressure factor = solubility

1.) Given that,

Pressure at NTP = 1 atm

Pressure conditions = 3 atm

Solubility = 0.348 g/ 100 mL

Therefore,

Solubility at 3 atm =

2.) Given that,

Pressure at NTP = 760 mm Hg

Pressure conditions = 1150 mm Hg

Solubility = 0.00412 g/ 100 mL

Therefore,

Solubility at 1150 mm Hg=

3.) Given that,

Therefore, pressure at 6200 ft = 1889.76 m (1ft = 0.3048 m) is

Now,

Solubility of CO₂ =

Solubility of O₂ =