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Checking Oxygen Limits in a Warming Tank 4 questions
Checking Oxygen Limits in a Warming Tank
Base your answers on the information provided and your knowledge of chemistry. Use the 2025 Chemistry Reference Tables as needed.
A classroom aquarium model contains 2.0 L of water. The table gives the maximum concentration of dissolved oxygen at each temperature when the water is in contact with a large supply of air. Assume the water volume stays fixed.
| Temperature (°C) | Maximum dissolved oxygen concentration (mg/L) |
|---|---|
| 10 | 10 |
| 25 | 8 |
Question 1
How much oxygen can the 2.0 L of water hold at the 25 °C limit?
- 4 mg
- 8 mg
- 16 mg
- 20 mg
Question 2
The water starts at its 10 °C limit. If it warms to 25 °C and reaches the new limit, calculate how much oxygen leaves the water.
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A separate model starts with the same 2.0 L of water at 25 °C but contains only 12 mg of dissolved oxygen. It is in a completely filled, sealed container with no air space. No chemical reaction produces or consumes oxygen.
Question 3
When the sealed model cools to 10 °C, will it automatically reach the 10 °C limit? Explain using the amount of oxygen in the container.
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Question 4
A student says a higher solubility means the water must contain more dissolved oxygen. Use the sealed model to evaluate that claim.
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