Chapter 12, Problem 12.81QP

Interpretation Introduction

Interpretation:

Osmotic pressure of a solution of a compound is given and number of ions in the solute compound has to be determined.

Concept Introduction:

In the process of osmosis, the solvent molecules pass through a semi - permeable membrane from less concentrated solution to more concentrated solution.  The pressure that has to be applied to prevent the flow of solvent molecules is called osmotic pressure.  It is expressed as,

$\pi =MRT$

Where,

$\begin{array}{l}\text{π}\text{= osmotic pressure}\\ \text{M}\text{= Molar concentration}\\ \text{R}\text{= Universal gas constant}\\ \text{T}\text{= Temperature}\end{array}$

Molarity or molal concentration is one of the many parameters that is used to express concentration of a solution.  It is expressed as,

$\text{Molarity = }\frac{number\text{ of }molesof\text{ solute}}{volume\text{ of solution in L}}$