Standard Hydrogen Eletrode

Standard hydrogen electrode is an electrode made of platinum, coated with platinum black, saturated with hydrogen gas under a pressure of 101,325 Pa at a temperature of 273.15 K, immersed in a solution with a medium activity of hydrogen ions a(H +< /sup>) = 1. A reaction takes place on it:


 *  ½H2 H+ + e- 

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