Purity, Formulations & Chromatography
1. This question has 5 part(s).
1.1. Green ink is made from mixing dyes together.
A student produced the chromatogram in Figure 1 when they investigated green ink using paper chromatography.
The solvent used was water.
Figure 1
The student took some measurements from the chromatogram.
The measurements are:
the yellow dye moves 4.8 cm
the solvent moves 6.0 cm
Calculate the Rf value of the yellow dye.
1.2. What would the Rf value of the blue dye be?
Tick (✓) one box.
Less than the Rf of the yellow dye | |
The same as the Rf of the yellow dye | |
Greater than the Rf value of the yellow dye | |
There is not enough information to determine the Rf value | |
Greater than 1.0 |
1.3. The green ink is made up of 25% blue ink and 75% green ink.
Which word correctly describes the green ink?
Tick (✓) one box.
Element | |
Mobile phase | |
Formulation | |
Compound |
1.4. Why could the green ink not be described as a pure substance?
1.5. The student repeated the investigation but used ethanol as the solvent instead of water.
The blue dye is not soluble in ethanol.
The yellow dye is more soluble in ethanol than water.
Which of the two statements about the resulting chromatogram are correct?
Tick (✓) two boxes.
It would have two spots above the start line | |
It would have one spot above the start line and one spot on the start line | |
The Rf value of the yellow dye would increase | |
The Rf value of the blue dye would be 1.0 | |
The yellow spot wouldn't travel as far up the paper |
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