Why is Hydrogen used as the standard electrode? (1 Viewer)

[enigma_1]

The cell potential thing..

I know it's zero but why??
And where di they get zero from?

 

[enigma_1]

And what is the oxidation reaction of bromine?

 

[AB940]

All the other eV values are relative to hydrogen, as far as I know. So, essentially hydrogen was picked as the standard (why exactly hydrogen, I don't know) and voltage produced when other elements/ions were oxidised/reduced by it was observed.

 

[Dementured]

And what is the oxidation reaction of bromine?

 

[Parvee]

http://en.wikipedia.org/wiki/Standard_hydrogen_electrode

 

[enigma_1]

Hmm which one do I use bro? I'm trying to find the cell potential of the elements: Aluminium and bromine.
Hence I need the oxidation reaction of bromine - but it's got 2 voltages.

 

[Dementured]

Potential of a cell containing Aluminium metal in a Bromine solution?