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In carbon dioxide electrode, the membrane separates which of the following?

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In carbon dioxide electrode, the membrane separates which of the following?

(a) Sodium carbonate, magnesium chloride

(b) Magnesium hydrogen carbonate, sodium chloride

(c) Sodium hydrogen carbonate, sodium chloride

(d) Magnesium carbonate, magnesium chloride

I got this question by my college director while I was bunking the class.

This intriguing question originated from Special Designs of Ion Selective Electrodes topic in portion pH Meters and Ion Analysers of Analytical Instrumentation

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Right answer is (b) Magnesium hydrogen carbonate, sodium chloride

Best explanation: In carbon dioxide electrode, the membrane separates sodium hydrogen carbonate and sodium chloride. Sodium hydrogen carbonate is the internal electrolyte.

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