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The electrodes used in pH measurement have which of the following internal resistances?
  • a)
    Very low resistance
  • b)
    Moderate resistance
  • c)
    Very high resistance
  • d)
    No resistance
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
The electrodes used in pH measurement have which of the following int...
The electrodes used in pH measurement have very high internal resistance. It is of the order of 1000M ohm.
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The electrodes used in pH measurement have which of the following int...



Internal Resistance of pH Electrodes
Internal resistance is an important factor to consider when using pH electrodes for measurement. pH electrodes have a very high internal resistance due to the unique composition of the reference and glass electrodes.

Reasons for High Internal Resistance
- The reference electrode is typically made of a silver/silver chloride wire immersed in a potassium chloride solution. This composition results in a high resistance.
- The glass electrode, which measures the pH of the solution, is made of a special glass membrane that is highly resistant to electrical flow.

Effects of High Internal Resistance
- The high internal resistance of pH electrodes can lead to slower response times and potential inaccuracies in pH measurements.
- It is important to properly condition and calibrate pH electrodes to ensure accurate readings despite the high internal resistance.

Conclusion
In conclusion, pH electrodes have a very high internal resistance due to the composition of the reference and glass electrodes. Understanding and accounting for this high resistance is crucial for accurate pH measurements.
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The electrodes used in pH measurement have which of the following internal resistances?a)Very low resistanceb)Moderate resistancec)Very high resistanced)No resistanceCorrect answer is option 'C'. Can you explain this answer?
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