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Which of the following is the effective concentration measured at the electrode head?

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Which of the following is the effective concentration measured at the electrode head?

(a) Selectivity coefficient

(b) Ionic strength

(c) Activity

(d) Activity coefficient

The question was posed to me in an international level competition.

The doubt is from Ion Selective Electrodes-Principle and Types in portion pH Meters and Ion Analysers of Analytical Instrumentation

1 Answer

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Best answer
The correct choice is (c) Activity

Explanation: Activity is the effective concentration measured at the electrode head. Concentration is different from the activity.

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