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Good choice for storing combination electrodes is in a buffer solution having which of the following pH?

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Good choice for storing combination electrodes is in a buffer solution having which of the following pH?

(a) pH1

(b) pH2

(c) pH3

(d) pH4

I had been asked this question by my college professor while I was bunking the class.

Question is taken from Combination Electrode in section pH Meters and Ion Analysers of Analytical Instrumentation

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Right option is (d) pH4

The explanation is: Good choice for storing combination electrodes is in a buffer solution having pH4. They can be stored in KCl solutions having particular pH values.

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