Chromatography Techniques and Principles

The video tutorial explains column chromatography, a technique for separating molecules using a column filled with a stationary phase. It covers the preparation of the column using wet and dry methods, the separation process, and different types of column chromatography based on the stationary phase used, such as adsorption, ion exchange, affinity, and gel permeation chromatography.

What is the primary role of the stationary phase in column chromatography?

• To facilitate the separation of molecules

• To dissolve the sample

• To increase the flow rate

• To support the mobile phase

Which material is NOT typically used as a stationary phase in column chromatography?

• Copper

• Cellulose

• Alumina

• Silica

In the wet method of column preparation, what is mixed with the stationary phase?

• A ligand

• A mobile phase

• A dry powder

• A pressurized gas

Why is it important to avoid bubbles during column preparation?

• They can change the color of the sample

• They can cause uneven separation

• They can increase the flow rate

• They can enhance the interaction with the mobile phase

What causes the molecules to separate in column chromatography?

• Differences in temperature

• Differences in color

• Differences in interaction with the mobile and stationary phases

• Differences in molecular weight

How can the flow rate of the mobile phase be increased?

• By decreasing the temperature

• By using pressurized gas

• By adding more sample

• By using a larger column

What is the term for the mobile phase leaving the column?

• Le white

• Effluent

• Eluate

• Leachate

Which type of chromatography uses an ion exchange resin as the stationary phase?

• Adsorption chromatography

• Ion exchange chromatography

• Affinity chromatography

• Gel permeation chromatography

What type of chromatography involves a ligand that binds specific molecules?

• Affinity chromatography

• Gel permeation chromatography

• Ion exchange chromatography

• Adsorption chromatography

Which stationary phase is used in gel permeation chromatography?

• Porous gel or bead

• Silica

• Alumina

• Cellulose