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Choosing a Dilution for Two Detector Bands 5 questions
Choosing a Dilution for Two Detector Bands
Base your answers on the information provided and your knowledge of chemistry. Use the 2025 Chemistry Reference Tables as needed.
A workshop uses two independent detector channels for a dissolved dye sample. Each channel is accurate from two to eight signal units, including the endpoints. A dilution divides each expected signal by the same dilution factor. The workshop must bring both channels into range in one measurement.
| Channel | Expected signal without dilution |
|---|---|
| P | 18 |
| Q | 6 |
Question 1
Which factor gives both readings inside the accurate range?
- Two
- Three
- Four
- All three
Question 2
Find the smallest possible factor that brings P into range and the greatest factor that keeps Q in range.
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Question 3
A student chooses a factor of four because it reduces P further. Explain why that decision fails the joint requirement.
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A new sample is expected to give P = 24 and Q = 4 before dilution. Its two channels have the same accurate range as before.
Question 4
Determine whether one dilution factor can bring both new readings into range. Show the limiting comparison.
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The workshop changes its procedure. It can prepare two separate portions of the new sample and use the in-range result from a different channel in each portion.
Question 5
Choose a dilution factor for each portion and identify which channel to use from each reading.
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