Chromatography Lab Concepts

The video tutorial introduces chromatography, a technique for separating mixtures. It outlines a lab activity to separate ink components using paper chromatography. The required materials include a beaker, pencil, black ink, filter paper, and tape. The setup involves drawing a line on the filter paper, applying ink, and placing it in water. Observations show that water moves up the paper, carrying dyes at different rates based on solubility. The activity demonstrates how chromatography separates substances and its applications in analyzing dyes and pigments.

What is the primary aim of the chromatography lab activity?

• To measure the density of ink

• To separate components of a dye

• To mix different dyes

• To observe the evaporation of water

Which of the following is NOT a material used in the chromatography experiment?

• Beaker

• Pencil

• Thermometer

• Black ink bottle

What is the purpose of drawing a line on the filter paper?

• To mark the top of the paper

• To indicate where to place the ink drop

• To create a design

• To measure the length of the paper

How should the paper strip be positioned in the beaker?

• With the ink drop below the water level

• Lying flat on the water surface

• Fully submerged in water

• With the ink drop just above the water level

Why is it important to leave the setup undisturbed during the experiment?

• To prevent the ink from drying

• To allow the water to evaporate

• To ensure accurate separation of dyes

• To keep the paper from tearing

What happens to the water as it moves up the filter paper?

• It evaporates quickly

• It dissolves the dyes and carries them upward

• It changes color

• It remains at the bottom

Which dye rises faster on the filter paper?

• The heavier dye

• The lighter dye

• The more soluble dye

• The less soluble dye

What is the role of capillary action in this experiment?

• To move water up the filter paper

• To dry the ink

• To dissolve the filter paper

• To change the color of the ink

What can chromatography be used to separate?

• Only chemical compositions of substances

• Various mixtures into individual components

• Only dyes in ink

• Only colored pigments in plants

Which of the following is an application of chromatography?

• Determining the chemical composition of substances

• Measuring the weight of substances

• Heating substances to high temperatures

• Mixing different chemicals