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Checking Precipitate Recovery After a Wash 4 questions
Checking Precipitate Recovery After a Wash
Base your answers on the information provided and your knowledge of chemistry. Use the 2025 Chemistry Reference Tables as needed.
A classroom separation model can make at most 15.0 g of a desired solid in each run. The collected dry material can include an impurity. A separate test measures the impurity mass in each dry sample.
| Wash plan | Collected dry mass (g) | Impurity in dry sample (g) |
|---|---|---|
| P | 13.0 | 3.0 |
| Q | 12.0 | 1.0 |
Question 1
Which wash plan recovers more of the desired solid?
- P only
- Q only
- The two plans recover the same amount.
- No comparison can be made from these readings.
Question 2
Calculate the percentage of the possible desired product recovered by Q.
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The exhibit needs at least 10.0 g of desired solid with no more than 0.50 g of impurity. A further wash of Q removes 0.80 g of the impurity and also dissolves 0.50 g of the desired solid.
Question 3
Determine whether Q after the further wash meets both requirements. Use the two masses in your answer.
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Question 4
Evaluate the claim that any wash that improves purity must also improve recovery of the desired solid.
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