Chapter 16, Problem 16.52P

Interpretation Introduction

Interpretation:

The final concentration of sea water at ${20}^{\circ }C$ when reverse osmosis stops has to be calculated.  The amount of sea water required to produce $15L$ of fresh water at ${20}^{\circ }C$ with an applied pressure of $75bar$ has to be calculated.

Concept Introduction:

The relationship between osmotic pressure, solute concentration and temperature for a solution is given below.

  $\Pi =RT{M}_c$

Where, $R$ is universal gas constant, $T$ is the absolute temperature and $M_c$ is the colligative molarity.  The colligative molarity can be expressed as given below.

  $M_c=i\times M$

Where, $i$ is the number of solute particles produced per formula unit that is dissolved.