mercury cell

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A primary voltaic cell consisting of a zinc anode and a cathode of mercury(II) oxide (HgO) mixed with graphite. The electrolyte is potassium hydroxide (KOH) saturated with zinc oxide, the overall reaction being:

Zn + HgO → ZnO + Hg

The e.m.f. is 1.35 volts and the cell will deliver about 0.3 ampere-hour per cm3.

Subjects: Chemistry — Physics.

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