Potential of hydrogen elctrode set up in acid solution of unknown strength is 0.295V at 25C when coupled with SHE. Find ph of the solution?
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The Nernst equation for electrode potential is given as:
The hydrogen electrode by definition has .
Potentials are usually cited as reduction potentials, so the half-equation is
That gives us
For a standard hydrogen electrode, the pressure of the hydrogen gas is taken to be as 1 bar. As a result, the equation can be rewritten as:
Since pH is defined as , the equation becomes:
which is equal to
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