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The standard hydrogen electrode is assigned a potential of

  • A.0.059 volts at 25 degrees Celsius
  • B.a value that depends on the pressure of hydrogen used
  • C.zero volts at all temperatures
  • D.one volt at 25 degrees Celsius

Answer: C

It is an arbitrary reference against which every other electrode potential is measured, since a single electrode's absolute potential cannot be determined. It consists of platinised platinum in acid of unit activity under one bar of hydrogen.

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