What pressure (bar) of H2 would be required to make emf of hydrogen electrode zero in pure water at 25ºC ? (A) 10–14 (B) 10–7 (C) 1 (D) 0.5 Allen Ans. (1)

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Question

What pressure (bar) of H2 would be required to make emf of hydrogen electrode zero in pure water at 25ºC ?

(A) 10–14
(B) 10–7
(C) 1
(D) 0.5 Allen Ans. (1)

Prashant Kotian · Accepted Answer

Correct answer: A. 2e– + 2H+(aq)  H2(g) H o P 0.059 E E log n [H ]    H 2 P 0.059 0 log (10 )    H 2 P log (10 )   H P 10  14 H P bar  

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