13 E cell = E solution – E reference electrode This means that: E solution = E cell + E reference electrode Assume the process of titration of Fe 2+ with Ce 4+, we have Fe 2+ + Ce 4+  Fe 3+ + Ce 3+ Fe 3+ + e  Fe 2+ E o = 0.771 V Ce 4+ + e  Ce 3+ E o = 1.70 V We have three cases to consider:
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