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Separating Ink Spots in Two Directions 4 questions
Separating Ink Spots in Two Directions
Base your answers on the information provided and your knowledge of chemistry. Use the 2025 Chemistry Reference Tables as needed.
A lab places a dot of ink at the starting mark of chromatography paper. Solvent 1 moves to the right. The paper dries, then solvent 2 moves upward. In this model each dye moves a fraction of each solvent’s travel distance. A dye that spends more time attracted to the paper generally moves a smaller fraction with that solvent.
| Reference dye | Fraction with solvent 1 | Fraction with solvent 2 |
|---|---|---|
| A | 0.25 | 0.75 |
| B | 0.75 | 0.25 |
| C | 0.75 | 0.75 |
Question 1
Which two reference dyes would overlap if the lab used only solvent 1?
- A and B
- A and C
- B and C
- All three
For the unknown ink, solvent 1 travels 8.0 cm and solvent 2 travels 4.0 cm. The figure shows where the two spots end up. The unknown contains only dyes listed in the table.
Question 2
Calculate both travel fractions for the upper spot. Identify the dye that matches both fractions.
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Question 3
A student identifies the lower spot as A because it is closer to the starting mark. Use the travel in both directions to evaluate the identification.
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Question 4
Predict where a third spot would appear if dye A were added. Explain which present dye travels the same fraction as A with solvent 2.
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