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Normally, electrodes measure which of the following parameters?

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Normally, electrodes measure which of the following parameters?

(a) Activity

(b) Activity co-efficient

(c) Blank constant

(d) Ionic co-efficient

I have been asked this question in exam.

This intriguing question comes from Sodium Analyser in portion Dissolved Component Analysers of Analytical Instrumentation

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The correct choice is (a) Activity

To elaborate: Normally, electrodes measure activity of the ion. It is a measure of free ions in the solution.

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