The reference half-cell of a pH analyzer is composed of:
a. silver anode. c. silver–silver chlo-ride.
b. platinum cathode. d. mercury–mercurous chloride.
ANS: D
A pH electrode's second cell is the reference cell. This reference half-cell is composed of mercu-ry–mercurous chloride (Hg/Hg2Cl2), which is immersed in a solution of saturated potassium chloride (KCl). Mercurous chloride is also known as calomel.
Health Professions
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