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In glass membrane electrode, the glass containing 11% Na2O, 18% Al2O3, 71% SiO2 is highly sensitive to which of the following ions?

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In glass membrane electrode, the glass containing 11% Na2O, 18% Al2O3, 71% SiO2 is highly sensitive to which of the following ions?

(a) Sodium

(b) Hydrogen

(c) Nitrogen

(d) Chlorine

The question was posed to me by my school teacher while I was bunking the class.

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

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Right answer is (a) Sodium

The best I can explain: In glass membrane electrode, the glass containing 11% Na2O, 18% Al2O3, 71% SiO2 is highly sensitive to sodium ions. Glass electrodes can be used to measure various ions by changing the glass membrane composition.

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