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Choosing a Measurement for an Ink Wash 4 questions
Choosing a Measurement for an Ink Wash
Base your answers on the information provided and your knowledge of chemistry. Use the 2025 Chemistry Reference Tables as needed.
A class compares equal volumes of liquid before and after a model ink wash. The colored marker in the liquid changes color with pH. A second measurement reports marker amount without relying on its color.
| Sample | pH | Color intensity (model units) | Marker amount (mg) |
|---|---|---|---|
| Before wash | 7.0 | 12 | 4.0 |
| After wash | 5.0 | 4 | 4.0 |
Question 1
Which statement follows from both measurements?
- The marker amount fell because the color faded.
- The marker amount stayed the same while pH and color intensity changed.
- The pH stayed the same while the marker amount changed.
- The color reading proves the marker became a different element.
Question 2
Explain why a new calibration made at pH 7.0 might give the wrong marker amount for a sample at pH 5.0.
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The class wants to isolate the effect of pH on the marker’s color. It has equal portions of one marker solution and a model control that adjusts pH without changing the amount of marker.
Question 3
Describe a matched comparison that tests this effect. State what should be changed and what should be measured.
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Question 4
If the class wants to compare marker amounts using only color, identify one condition the standards and samples must share in this model.
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