Explore BrainMass

Semi-Empirical Expression for a Dilute Real Solution

Starting with the definition of osmotic pressure

Pi = -RT/V_ml * ln * (p_so*ln)/(p_1)^0

Derive the semi-empirical expression for a dilute real solution

Pi/C' = RT/M_2 + bC'

Where C' is the concentration expressed in (g solute)/(dm3 solution) and b is known as the interaction constant. Then use the semiempirical formula to determine the molar mass of inulin (C6H10O5)x from the following data at 200C.

C' (gsolute/dm3soln) 103.8 77.1 50.9 25.2
Pi (bar) 0.86 0.58 0.31 0.14

© BrainMass Inc. brainmass.com July 21, 2018, 7:23 pm ad1c9bdddf

Solution Preview

The key is to expand ln x in a Taylor series for x small and with x small the terms psol/P1o give only two ...

Solution Summary

This solution provides extensive discussion to help the student understand the concepts involved. Websites for further reference are included. 880 words.