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Crystal membrane of ion selective electrode can be regenerated by washing with which of the following?

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Crystal membrane of ion selective electrode can be regenerated by washing with which of the following?

(a) Alcohol

(b) Iodine solution

(c) Acidic solution

(d) Basic solution

I have been asked this question during an interview.

Question is taken from Ammonia and Fluoride Electrode topic in division pH Meters and Ion Analysers of Analytical Instrumentation

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Correct answer is (a) Alcohol

The explanation is: Crystal membrane of an ion selective electrode can be regenerated by washing with alcohol. It can be gently polished with emery paper to remove deposits.

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