Internal Reference electrode is of _______(a) gold(b) silver(c) platinum(d) graphiteThe question was posed to me in an international level competition.The doubt is from Spirometry topic in portion Pulmonary Function Analysers of Biomedical Instrumentation

Internal Reference electrode is of _______(a) gold(b) silver(c) platin

1.	Internal Reference electrode is of _______(a) gold(b) silver(c) platinum(d) graphiteThe question was posed to me in an international level competition.The doubt is from Spirometry topic in portion Pulmonary Function Analysers of Biomedical Instrumentation
Answer» The correct choice is (B) silver To explain I would say: The internal reference ELECTRODE is silver/silver chloride and the calomel reference electrode is CONNECTED to a small pool of saturated KCI, through a porous pin. Accuracy of 0.001 pH can be OBTAINED with this electrode against a CONSTANT buffer.

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