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Comparing Base Use for Two Model Acids 4 questions
Comparing Base Use for Two Model Acids
Base your answers on the information provided and your knowledge of chemistry. Use the 2025 Chemistry Reference Tables as needed.
A class compares two model molecular acids. Each P molecule can transfer one proton to a base. The class tests whether each Q molecule can transfer one or two protons. The model uses one OH- ion per proton removed and tracks when the first proton per molecule has been removed separately from the point of complete neutralization.
| Sample | Amount of acid (mmol) | OH- used at first-proton point (mmol) | OH- used at complete neutralization (mmol) |
|---|---|---|---|
| P | 4 | 4 | 4 |
| Q | 4 | 4 | 8 |
Question 1
Which interpretation of Q fits its separate test?
- Each Q molecule transfers no protons.
- Each Q molecule transfers one proton.
- Each Q molecule transfers two protons.
- Each Q molecule transfers four protons.
Question 2
Explain why the first-proton point by itself would fail to distinguish the two model acids.
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The class compares another P sample containing 8 mmol of P with a Q sample containing 4 mmol of Q.
Question 3
Predict the total amount of OH⁻ used for complete neutralization of each new sample. Show your work.
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Question 4
A student measures only the final amounts and calls the new samples identical. Identify an earlier reading that could distinguish them and predict its value for each sample.
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