Question

Which of the following makes contact with a solution whose pH is to be measured?

(a) Ceramic plug

(b) Electrolyte

(c) Silver wire

(d) Reference solution

The question was asked in class test.

This key question is from Instrumentation and Control topic in chapter Instrumentation and Control of Fermentation Technology

Answer 1

Correct answer is (a) Ceramic plug

For explanation: The ceramic plug or bulb is the part of an electrode which makes the contact with the solution whose pH is to be measured. Electrolyte, Silver wire, Reference solution are the part of pH electrodes.