What is Henry’s law?
Henry’s law defines that at constant temperature, the concentration of the gas that is dissolved in a given liquid is proportional to the partial pressure of the gas above the fluid.
Henry Law Formula
The Henry’s law constant is the expression for equilibrium distribution of a compound between water and gaseous phase denoted by KH. It indicates the volatility of the compound.
The mathematical expression for Henry’s law is given by
C is the solubility of the gas at a fixed temperature in a solvent (units in M or ml gas/L).
is the Henry’s law constant (units in M/atm)
is the partial pressure of the gas (units in Atm)
Determine the quantity of carbon dioxide dissolved in a 1L bottle of carbonated water if the pressure of 2.4 atm is applied in the bottling process at 25 Degree Celsius? Given that of in water is 29.76 atm/(mol/L) at 25 Degree Celsius.
We know the equation
C = P/KH
= 2.4 /29.76
= 0.08 mol/L of CO2
To convert into grams,
1 mole of CO2
= 12 + (16 x 2) = 44g
Mass of CO2 in grams = mol of CO2 x 44 g/mol
= 8.06 x 10-2 x 44
= 3.52 g of CO2 is dissolved in 1 L of carbonated water.
Determine the solubility of carbon dioxide in water at 0oC and pressure of 3.0 atm. Given that Carbon dioxide solubility is 0.348 g/100 mL.
We know that solubility of carbon dioxide gas is directly proportional to the pressure of the gas over the liquid.
We have the equation
Solubility = 0.348g /100 mL x 3 atm/1 atm
= 1.044 g/100 mL of water.
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