The hydrogen electrode is dipped in a solution of pH = 3 at 25 ° C . The potential of the electrode will be - ______ × 10 - 2 V . 2 . 303 RT F = 0 . 059 V Round off the answer to the nearest integer.

Step-by-step solution

Given, pH = 3 ⇒ - log [ H + ] = 3 [ H + ] = 10 - 3 The half cell reaction is 2 H ( aq . ) + + 2 e - → H 2 g We know, the Nernst equation is E red = E 0 red + 0 . 059 log [ H + ] = 0 + 0 . 059 log 10 − 3 = + 0 . 059 × ( − 3 ) = − 0 . 177 V = - 17 . 7 × 10 - 2 V .