Answer:
0.697 V
Explanation:
The potential of the half-cell of silver-silver chloride (Ag/AgCl) is +0.197 V vs SHE (Standard Hydrogen Electrode)
The potential of the half-cell of the saturated calomel electrode (SCE) is +0.242 V vs SHE.
So the difference in potential between Ag/AgCl and SCE is 0.045 V. We substract that value from the readings made with Ag/AgCl to convert them to SCE readings:
0.742 V - 0.045 V = 0.697 V
