# What is the standard reduction potential of a standard hydrogen electrode?

Think about it; you use the standard reduction potential for the standard hydrogen electrode as a reference standard. i.e. another standard reduction potential is in reference to that of the standard hydrogen electrode. So it must be $\text{0 V}$.
$2 {H}^{+} \left(a q\right) + 2 {e}^{-} \to {H}_{2} \left(g\right)$
CHALLENGE: The saturated calomel electrode is another commonly-used reference electrode, with a standard reduction potential of $\text{0.2444 V}$ relative to the standard hydrogen electrode. Convert one standard reduction potential of your choice to be in reference to the saturated calomel electrode.
$H {g}_{2}^{2 +} + 2 C {l}^{-} \to H {g}_{2} C {l}_{2} \left(s\right)$