Question

what is standard hydrogen electrode draw​

Answer 1

The standard hydrogen electrode consists of a platinum electrode coated with platinum black. The electrode is dipped in an acidic solution and pure hydrogen gas is bubbled through it.

H+ (aq) + e– →1/2H2(g).

The concentration of both the reduced and oxidised forms of hydrogen is maintained at unity . This implies that the pressure of hydrogen gas is one bar and the concentration of hydrogen ion in the solution is one molar.