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Checking Neutralization With Two Sensors 4 questions
Checking Neutralization With Two Sensors
Base your answers on the information provided and your knowledge of chemistry. Use the 2025 Chemistry Reference Tables as needed.
A class simulates adding sodium hydroxide to hydrochloric acid at 25 °C. In the model, H+ and OH- react to form water, while Na+ and Cl- remain dissolved. A pH sensor and a conductivity sensor read the same sample after each addition.
H+(aq) + OH-(aq) → H2O(l)
| Stage | pH | Conductivity (model units) |
|---|---|---|
| Before adding base | 2.0 | 14 |
| At neutral pH | 7.0 | 5 |
| With excess base | 11.0 | 10 |
Question 1
Which conclusion matches the readings at neutral pH?
- The solution is neutral and gives a nonzero conductivity reading.
- The solution is acidic and gives no conductivity reading.
- The solution is basic and gives the lowest pH.
- The solution has no dissolved particles.
Question 2
Identify the two ions from the model that can still carry charge at neutral pH. Explain why the neutralization equation does not remove them.
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A student dilutes a separate portion of the neutral solution with pure water at the same temperature. The conductivity reading drops. The pH stays close to 7.0.
Question 3
Explain why the two sensor readings can respond differently to dilution.
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Question 4
Name a control reading that would help the class check whether the low conductivity is from the sample or from the sensor itself. Explain how to use it.
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