
Concept explainers
Determine osmotic pressures for each solution given. Assume complete dissociation of the solute.
(a)
(b)
(c)

(a)
Interpretation:
The osmotic pressure at
Concept introduction:
Osmotic pressure is defined as the minimum pressure applied on the solution to stop the flow of solvent molecules through the semi-permeable membrane.
Osmotic pressure is a colligative property and depends on the number of atoms of particle of the substance present in material.
Answer to Problem 7.86E
The osmotic pressure of the given solution is
Explanation of Solution
The given temperature is
The composition of the solution containing
Where,
•
•
•
Substitute the values of given mass and molar mass in the above formula to calculate the composition.
The mole fraction of component 1
On complete dissociation of
The osmotic pressure of the solution is given as,
Where,
•
•
•
Substitute the values of
The osmotic pressure of the given solution is
The osmotic pressure of the given solution is

(b)
Interpretation:
The osmotic pressure at
Concept introduction:
Osmotic pressure is defined as the minimum pressure applied on the solution to stop the flow of solvent molecules through the semi-permeable membrane.
Osmotic pressure is a colligative property and depends on the number of atoms of particle of the substance present in material.
Answer to Problem 7.86E
The osmotic pressure of the given solution is
Explanation of Solution
The given temperature is
The composition of the solution containing
Where,
•
•
•
Substitute the values of given mass and molar mass in the above formula to calculate the composition.
The mole fraction of component 1
On complete dissociation of
The osmotic pressure of the solution is given as,
Where,
•
•
•
Substitute the value of
The osmotic pressure of the given solution is
The osmotic pressure of the given solution is

(c)
Interpretation:
The osmotic pressure at
Concept introduction:
Osmotic pressure is defined as the minimum pressure applied on the solution to stop the flow of solvent molecules through the semi-permeable membrane.
Osmotic pressure is a colligative property and depends on the number of atoms of particle of the substance present in material.
Answer to Problem 7.86E
The osmotic pressure of the given solution is
Explanation of Solution
The given temperature is
The relationship between molality and mole fraction is,
The term
Where,
•
•
•
Rearrange the equation for the value of
Substitute the value of molality of
Thus, the value of
On complete dissociation of
The osmotic pressure of the solution is given as,
Where,
•
•
•
Substitute the value of
The osmotic pressure of the solution is
The osmotic pressure of the given solution is
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Chapter 7 Solutions
Physical Chemistry
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