Chemistry - Electrochemistry Question with Solution | TestHub

ChemistryElectrochemistryMiscellaneous/MixedEasy2 minPYQ_2020
ChemistryEasynumerical

pH of the anodic solution of the following cell is
Pt,  H 2  (1 atm)   H +   xM    H +   1 M    H 2 (1 atm), Pt
if E cell = 0.2364 V.

Answer:
4.00
Solution:

At Cathode:
2H+1M+2e-→H2g
At Anode:
H2g→2H+xM+2e-

Now:
E Cell = E Cell o − 0.0591 2 log [H + ] anode 2 [H + ] cathode 2
ECell=ECellο-0.05912log⁡[H+]anode[H+]cathode2
ECell=ECellο-0.05912log⁡x12
0.2364=0-0.05912log⁡x12
0.2364×2=−0.0591 log x 1 2
0.2364×20.0591=-log⁡x12
-log⁡x12=0.2364×20.0591=8
−2 log x 1  = 8
log⁡x1=-4
x=10-4
pH=-log⁡(x)
pH=4

Stream:NTA_ABHYASSubject:ChemistryTopic:ElectrochemistrySubtopic:Miscellaneous/Mixed
⏱ 2mℹ️ Source: PYQ_2020

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