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The composition of glass membrane in glass electrode cannot have which of the following?

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The composition of glass membrane in glass electrode cannot have which of the following?

(a) Sodium silicate

(b) Calcium silicate

(c) Lithium silicate

(d) Barium silicate

I got this question during an interview for a job.

My enquiry is from Hydrogen and Glass Electrodes topic in section pH Meters and Ion Analysers of Analytical Instrumentation

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Right choice is (d) Barium silicate

Best explanation: Glass electrode consists of either sodium or calcium silicate or lithium silicates containing glass membrane. It has lanthanum and barium ions added to the membrane.

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