Chapter 12.9, Problem 12.18E

Interpretation Introduction

Interpretation:

Of the following ionic substances – $NaCl,MgC{l}_2,AlC{l}_3$, the most effective ionic substance that coagulates the negatively charged colloidal Sulfur consists of $S_2{O}_3{}^{-}$ ions has to be identified.

Concept Introduction:

Based on the particle size of the components, solutions can be of three types – true solutions, colloidal solutions and suspension.  Colloidal solutions have the particle size of the range $1-1000nm.$

A colloidal solution is made of dispersed phase and dispersion medium which corresponds to solute and solvent respectively.  Depending upon the physical state of dispersed phase and dispersion medium, there are various types of colloids such as gel, foam, alloy, sol etc.