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Question
Answer the following.
The osmotic pressure of CaCl2 and urea solutions of the same concentration at the same temperature are respectively 0.605 atm and 0.245 atm, calculate van’t Hoff factor for CaCl2.
Solution
Given: Osmotic pressure of CaCl2 solution = 0.605 atm
Osmotic pressure of urea solution = 0.245 atm
To find: The value of van’t Hoff factor
Formulae: π = MRT, π = iMRT
Calculation: For urea solution
π = MRT
0.245 atm = MRT ....(i)
For CaCl2 solution
π = iMRT
0.605 atm = iMRT ....(ii)
From equations (i) and (ii),
`0.605/0.245 = "iMRT"/"MRT"`
∴ i = 2.47
The value of van’t Hoff factor is 2.47.
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