First slide

Theory of dilute solutions

Question

The osmotic pressure of 40% (weight/volume) urea solution is 1.64 atm and that of 3 .42% (weight/volume) cane sugar is 2.46 atm. When equal volumes of the above two solutions are mixed, the osmotic pressure of the resulting solution is

Moderate

A

1.64 atm
B

2.46 atm
C

4.10 atm
D

2.05 atm

Solution

$π = \frac{π_{1} + π_{2}}{2}$ , if equal volumes are mixed, volume of solution becomes double.

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