Question

Sodium selective electrode provides a good response in measurement when the pH is above which of the following values?

(a) 2

(b) 3

(c) 5

(d) 10

The question was posed to me during an interview for a job.

I want to ask this question from Sodium Analyser in chapter Dissolved Component Analysers of Analytical Instrumentation

Answer 1

Correct answer is (d) 10

For explanation: Sodium selective electrode provides a good response in measurement when the pH of the solution is above 10. Hence, the buffer solution is used.