Question

9. Henry's Law states that the quantity of a gas that will dissolve in a liquid is proportional to the partial pressure of the gas and its solubility coefficient (its physical or chemical attraction for water), at a given temperature a) Henry's Law: The volume of a gas (Vx) dissolved in a liter of water is Vx= (p3)*(SC) where pX is the partial pressure in atmospheres and SC is the solubility coefficient b) At one atmosphere and 37 degrees Celsius, the solubility coefficient for oxygen is 0.024 ml O2/ml H20. How much oxygen can dissolve in a liter of water at 37 degrees Celsius if the partial pressure of oxygen is 85 mm Hg c) At one atmosphere and 20 degrees Celsius, the solubility coefficient for Carbon dioxide is 0.88 ml CO2/ml H20 at one atmosphere. How much CO2 can dissolve in a liter of water at 20 degrees Celsius if the partial pressure of CO2 is 38 mm Hg? 10. What factors are responsible for rates of diffusion from gas to water? Explain why carbon dioxide will diffuse more rapidly than oxygen from air to water, if both are at the same partial pressure

Answer 1

Question 9.

Part b.

According to Henry's law:

volume of O2/1000 mL H2O = (85/760) atm * 0.024 mL O2/mL H2O

i.e. The volume of oxygen = 2.684 mL

Part c.

According to Henry's law:

volume of CO2/1000 mL H2O = (38/760) atm * 0.88 mL CO2/mL H2O

i.e. The volume of carbon dioxide = 44 mL