Class XII
Chapter : Solutions
Osmotic Pressure and Calculation of Molecular Weight of Solute
"The process of flow of the solvent is called osmosis".
The flow of the solvent from solvent side to solution side across a semipermeable membrane can be stopped if some extra pressure is applied on the solution.
"Pressure that just stop the flow of solvent is called osmotic pressure of the solution."
The osmotic pressure of a solution is the excess pressure that must be applied to a solution to prevent osmosis, to stop the passage of the solvent molecules through a semipermeable membrane into the solution.
" Osmotic pressure is proportional to the molarity, C of the solution at a given temperature T."
П = CRT
П represent osmotic pressure
R represent gas constant
Therefore,
П = (n₂/V)RT
Here V is the volume of a solution in litres containing n₂ moles the solute.
Let the weight of the solute of w₂ grams of solute, of molar mass M₂ is present in the solution.
Therefore,
n₂ = w₂/M₂
ПV = w₂RT/M₂
M₂ = w₂RT/ПV
Chapter : Solutions
Osmotic Pressure and Calculation of Molecular Weight of Solute
"The process of flow of the solvent is called osmosis".
The flow of the solvent from solvent side to solution side across a semipermeable membrane can be stopped if some extra pressure is applied on the solution.
"Pressure that just stop the flow of solvent is called osmotic pressure of the solution."
The osmotic pressure of a solution is the excess pressure that must be applied to a solution to prevent osmosis, to stop the passage of the solvent molecules through a semipermeable membrane into the solution.
" Osmotic pressure is proportional to the molarity, C of the solution at a given temperature T."
П = CRT
П represent osmotic pressure
R represent gas constant
Therefore,
П = (n₂/V)RT
Here V is the volume of a solution in litres containing n₂ moles the solute.
Let the weight of the solute of w₂ grams of solute, of molar mass M₂ is present in the solution.
Therefore,
n₂ = w₂/M₂
ПV = w₂RT/M₂
M₂ = w₂RT/ПV
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