Presentation on theme: "Gas Solubilities Henry’s Law: [A]equilibrium = SA · pA"— Presentation transcript:
1 Gas Solubilities Henry’s Law: [A]equilibrium = SA · pA “the partial pressure of a gas above a liquid is proportional to theconcentration in liquid under thermodynamic equilibrium”Bunsen coefficient (β)“the volume of a gas at STP (0°C and 1atm) that dissolves in oneunit volume of solution at temperature T with a total pressure of1 atm and a fugacity (chemical potential--tendency of a gas toprefer one phase of another, escape or expand) 1 atm”Solubility function (F)
2 The Bunsen coefficient fugacitycorrects partial pressure for the non-ideal behavior of gasCombining the Bunsen coeff. with solubilityDropped, for near-ideal behavior
3 Concentration of a gas in seawater is determined by its partial pressure in moist air. The relationship between the partial pressures of moist and dry air.Saturation water vaporSolubility function (FA)
4 Solubilities decrease with increased temperature Differences between gases can be caused by molecular weight and other factors such as molecular interaction between the gas and water.For single element gases, more soluble with increased molecular weight.