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# Henry's Law Calculations

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Sections
Solutions: Solubility and Intermolecular Forces
Molality
Parts per Million (ppm)
Mole Fraction
Solutions: Mass Percent
Types of Aqueous Solutions
Intro to Henry's Law
Henry's Law Calculations
The Colligative Properties
Boiling Point Elevation
Freezing Point Depression
Osmosis
Osmotic Pressure
Vapor Pressure Lowering (Raoult's Law)
The Freezing Point Depression (IGNORE)

To calculate solubility of a dissolves gas, Henry's Law Constant and partial pressure are used.

###### Henry's Law Calculations

Concept #1: Henry's Law Formula

Example #1: Calculate the solubility of carbon dioxide gas, CO2, when its Henry’s Law Constant is 8.20 x 102 M/atm at 3.29 atm?

Concept #2: Henry’s Law (2 Point Form)

The 2 Point Form of Henry's Law Formula is used when dealing with 2 pressures and 2 solubilities of a given gas.

Example #2: At a pressure of 2.88 atm the solubility of dichloromethane, CH2Cl2, is 0.384 mg/L. If the solubility decreases to 0.225 mg/L, what is the new pressure?

Practice: Henry’s Law Constant for nitrogen in water is 1.67 × 10-4 M • atm–1. If a closed canister contains 0.103 M nitrogen, what would be its pressure in atm?

Practice: At 0°C and 1.00 atm, as much as 0.84 g of O2 can dissolve in 1.0 L of water. At 0°C and 4.00 atm, how many grams of O2 dissolve in 1.0 L of water?

Practice: The atmospheric pressure in a lab is calculated as 1.3 atm. If oxygen gas contributes 62% of this atmospheric pressure, determine its mass (in g) dissolved at room temperature in 25 L of water. The Henry’s Law Constant for oxygen in water at this temperature is 5.3 × 10–5 M/atm.