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Mr. Gibson Room 213 Solubility of Gases in Solution As a function of temperature & Pressure Solubility - Gases There are three things that affect the solubility (the ability to dissolve) of a solute into a solvent. 1. Surface area of the solute. You can crush a crystalline solid (thus make smaller crystals). By doing this… you’ve increased the surface area which allows more efficient flow of solvent Solubility - Gases There are three things that affect the solubility (the ability to dissolve) of a solute into a solvent. 1. Surface area of the solute. You can crush a crystalline solid (thus make smaller crystals). By doing this… you’ve increased the surface area which allows more efficient flow of solvent Solubility - Gases There are three things that affect the solubility (the ability to dissolve) of a solute into a solvent. 2. Temperature of the solvent. Solubility - Gases There are three things that affect the solubility (the ability to dissolve) of a solute into a solvent. 3. Increasing the pressure above the solution. Solubility of Gases As a side-bar… What is the “equivalent fraction” in the problem to the right? 1= X 2 4 Solubility of Gases When you converted the one-half to two-fourths what exactly did you do to the “2” to get it to be a “4”? 1= X 2 4 Solubility of Gases Exactly! You doubled it. And as the “2” “went up” to be a “4”…. The “1” also had to “go up” to become a “2” (you doubled it too). 1= X 2 4 Solubility - Gases When we have dissolved a GAS into a liquid solvent… Henry’s Law applies when calculating all sorts of things. Henry’s Law states: At a given temperature… The solubility (S) of a gas in a liquid is directly proportional to the pressure (P) of the gas ABOVE the liquid. Solubility - Gases Henry’s Law At a given temperature… The solubility (S) of a gas in a liquid is directly proportional to the pressure (P) of the gas ABOVE the liquid. S1 = S2 P1 P2 Where P or pressure is stated in the unit “atmospheres” (atm); Solubility is stated as g/L Solubility of Gases So… just like our equivalent fraction exercise earlier… You are usually given three of the four numbers in Henry’s law and you simply have to isolate the unknown “4th” number and solve. 1= X 2 4 Solubility - Gases Henry’s Law As practice… do problems 1 & 2 on page 461 in your texts using the schoolrack uplink to submit your work. S1 = S2 P1 P2 Where P or pressure is stated in the unit “atmospheres” (atm); Solubility is stated as g/L