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04/10/2020 11:30 am
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A hydrogen electrode is immersed in a solution with pH = 0 (HCl). By how much will the potential (reduction) change if an equivalent amount of NaOH is added to the solution. (Take pH2 = 1 atm), T = 298 K.
(a) increase by 0.41 V
(b) increase by 59 mV
(c) decrease by 0.41 V
(d) decrease by 59 mV
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04/10/2020 11:34 am
(c) decrease by 0.41 V
Explanation:
pH changes from 0 to 7.
∴ [H+] changes from 1 to 10-7M
Accordingly Ered. = -0.059/n log 1/[H+]
= 0.059 log 10-7
i.e., 0.059 x (-7) = -0.41 volt.