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Chapter 12 Lecture 3

# Chapter 12 Lecture 3 - 2 N 2 mixture in water is 2.5...

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Solubility: What you have seen so far: Varying amounts of Water + sugar Vary Temperature

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Solubility 1. Will it dissolve? Like Dissolved like Dissolve in water? C 6 H 5 Cl C 6 H 5 OH HOCH 2 CH 2 OH Ionic Compounds Yes!……but Solubility Rules 2. How much will dissolve? Solubility is a function of temperature? Temp g/100g H 2 0 NH 4 Cl KNO 3 20 80 40 160
How much will dissolve? How many grams of NH 4 Cl will dissolve in 55 g of H 2 O @ 20 o C? Add Water or Heat Quantitatively describe what happens when 50 grams of KNO 3 is mixed with 50 grams of H 2 O at 20 o C?

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Solubility of gases in Liquids What you Know already DP Fish How many grams of water should be added to a mixture to dissolve all the salt?
Solubility of gases in liquids - Henrys’ Law S = kP gas S P gas mg/ 100 g H 2 O atm 1 10 10 @ 20 o C O 2 CO 2

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Solubility of gases is also a function of temperature T o C S mg/100g H 2 O 20 100 @ 1 atm Total P O2 = 0.2 atm 0 1.5 0.5 Oxygen in water
If the solubility of air (O

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Unformatted text preview: 2 + N 2 mixture) in water is: 2.5 mg/100g H 2 O @ 20 o C and 1.5 mg/100g H 2 O @ 80 o C What mass of gas will be released from 250 g of water that is saturated with air at 20 o C, then heated to 80 o C? Vapor Pressure of solutions: Raoult’s Law P solv = X solv P o solv Other useful equations: .... 3 2 1 1 1 n n n n X + + = P T = P 1 + P 2 + P 3 + … What is the vapor pressure of water P o H2O over 100 g of water? T = 20 o C What is the vapor pressure of water, over a solution made with 100 g of water and 2 g of sugar (MM 180)? T = 20 oC Mixtures of Liquids What is the vapor pressure of water above a 4.0 M solution of glycerol at 20 o C? Other Stuff you need: Density of solution is 1.073g/mL, MM glycerol 92, P o H2O @ 20 o C is 17.5 mmHg...
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