At a certain temperature, the value of the slope of plot osmotic pressure (π) against concentration (C in mol L−1) of a certain polymer solution is 291 R. The temperature at which osmotic pressure is measured, is: (R is gas constant)
A
271oC
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B
18oC
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C
564K
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D
18K
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Solution
The correct option is B18oC The relationship between the osmotic pressure and the concentration is Π=CRT
For the plot of osmotic pressure (π) against concentration (C in mol /L)
Slope =RT=291R T=291K=18oC
Thus the temperature at which osmotic pressure is measured is 18oC.