In the construction of a calomel electrode, the KCl solution must be saturated with calomel . What does this mean? Share with your friends Share 0 geeth27... answered this Calomel electrode acts as a reference electrode. Calomel electrode consists of a Hg and HgCl2 solution. Compared to Standard hydrogen electrode this calomel electrode is easy to maintain. Here the paste of HgCl2and solid Hg attached to a rod is immersed in saturated KCl solution. Saturated solution of KCl allows the exchange of ions through a porous salt bridge, which is used to complete the circuit. 12 HgCl2 + e- ↔Hg + Cl- 0 View Full Answer