Introduction to separation techniques 3

CHEMISTRY SSS1 First Term

WEEK 7

Introduction to separation techniques 3

Performance Objectives

The student should be able to:

1. Explain Chromatography method
2. Explain Sublimation method
3. Differentiate between pure and impure substances

Content

Chromatography

Chromatography is a method by which a mixture is separated by distributing its components between two phases. The stationary phase remains fixed in place while the mobile phase carries the components of the mixture through the medium being used. The stationary phase acts as a constraint on many of the components in a mixture, slowing them down to move slower than the mobile phase. The movement of the components in the mobile phase is controlled by the significance of their interactions with the mobile and/or stationary phases.…