Discussion
Why is a combination electrode convenient in routine work?
Answer: D
A combination electrode packages the measuring and reference half cells concentrically in a single probe, so one connector and one immersion serve for both, and the two elements stay at the same temperature. Calibration against buffers is still required at least daily, most designs still carry a filling solution or a gel equivalent, and non-aqueous work needs special constructions and gives readings that are at best comparative. Convenience is the whole gain, and it is enough to have made the separate pair rare outside teaching laboratories.
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