Planning and Designing Chemistry Lab- Different brands of permanent markers contain the same dyes in their black inks; however the markers are insoluble in water

Planning and Designing Chemistry Lab- Different brands of permanent markers contain the same dyes in their black inks; however the markers are insoluble in water

Problem:

Different brands of permanent markers contain the same dyes in their black inks; however the markers are insoluble in water.

Hypothesis:

Different brands of markers contain the same dyes in their black ink

Aim:

To investigate if four (4) different brands of permanent markers contains the same dyes in their black inks using paper chromatography.

Apparatus:

4 different brands of markers, alcohol, filter paper, scissors, ruler, beakers

Method

1. Fill a beaker with 30ml alcohol

2. Cut a rectangular strip of filter paper

3. Using one of the makers place a dot 1cm from the end of the filter paper.

4. Partially immerse the tip of the filter paper closest to the ink spot in the beaker with the alcohol.

5. Record your observations.

6. Allow the filter paper to dry.

7. Repeat the procedure for the remaining three (3) markers and ensure that the dot is of the same size for each marker.

8. Tabulate results and calculate the retention factor (Rf) of each of the markers

Variables

  • Manipulated- different brands of marker
  • Controlled- the volume of alcohol and the size of the dots
  • Dependent/Responding – the retention factor

Chemistry diagram 2

All four brands of marker will contain the same dyes therefore the hypothesis is true

Assumption:

The four brands of markers contain the same types of dye.

 

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