Question 11.13: USING OSMOTIC PRESSURE TO CALCULATE THE MOLARITY OF A SOLUTI...

USING OSMOTIC PRESSURE TO CALCULATE THE MOLARITY OF A SOLUTION

A solution of an unknown substance in water at 293 K gives rise to an osmotic pressure of 5.66 atm. What is the molarity of the solution?

STRATEGY

We are given values for $\Pi$ and T , and we need to solve for M in the equation $\Pi$ = MRT.

Rearranging this equation, we get

M = $\frac{\Pi}{RT}$

where $\Pi$ = 5.66 atm, R = 0.082 06(L · atm)/(K · mol), T = 298 K.

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