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Describe the construction and working of...

Describe the construction and working of standard hydrogen electrode. 

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Labelled diagram
`H^++e^(-) leftrightarrow1//2 H_2 OR 2H^+ +2e^(-) leftrightarrow H_2`
`Pt|1//2H_2(g)|HCl`
(1 atm) 1M
Platinised platinum foil is sealed to the end of a glass tube enclosed in an outer jacket having a bell shaped bottom. It is kept in a beaker containing 1M HCl. Pure & dry `H_2` gas passed at 1atm in to the outer jacket. `H_2` gas absorbed `H_2 and H^+` ions in the solution. Due to this the potential is developed. It is taken as zero volt.
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