Paper Chromatography Concepts and Techniques

This video tutorial covers the basics of paper chromatography, explaining its purpose in separating mixtures of inks or dyes. It provides a detailed guide on setting up a paper chromatogram, including drawing a pencil line, applying ink, and using a chromatography column. The video also includes questions for viewers to test their understanding and concludes with a review of common mistakes in setting up a chromatogram.

What is the primary purpose of paper chromatography?

• To mix different inks together

• To separate mixtures of inks or dyes

• To create new colors

• To dissolve inks in water

Why is a pencil used to draw the baseline on chromatography paper?

• Because it is insoluble

• Because it is soluble

• Because it is erasable

• Because it is colorful

What is the role of the mobile phase in chromatography?

• To stay stationary

• To move up the paper and carry the ink

• To change the color of the ink

• To dissolve the paper

What is the stationary phase in paper chromatography?

• The ink

• The water

• The chromatography paper

• The pencil line

What should be done after the water reaches near the top of the chromatography paper?

• Add more ink

• Add more water

• Remove the paper and draw a line where the water stopped

• Let it dry completely

In the forensic case study, what was the purpose of using paper chromatography?

• To identify the person responsible for altering a check

• To create a new ink

• To measure the thickness of ink

• To test the durability of paper

What does it mean if an ink spot does not move during chromatography?

• The ink is too dark

• The ink is too light

• The ink is insoluble

• The ink is very soluble

Which ink had the most soluble color in the forensic case study?

• Ink A

• Ink C

• Ink D

• Ink B

What was the main error in the student's method for setting up a chromatogram?

• Using a pen to draw the baseline

• Adding too much water

• Using too little ink

• Not letting the ink dry

What should be avoided when placing chromatography paper in the column?

• Letting the paper dry

• Adding ink to the cross

• Using a pencil to draw the baseline

• Letting the ink touch the water