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Quinhydrone electrode is sometimes used ...

Quinhydrone electrode is sometimes used to find the pH of a solution. It is based on the following electrode reaction:

Its standard electrode potential is 0.70 V. if in a particular solution, the electrode potential is found to be 0.58 V, the pH of the solution is

A

2

B

4

C

6

D

8

Text Solution

Verified by Experts

The correct Answer is:
A
For the given electrode reaction (reduction reaction),
`E=E^(@)-(0.0591)/(2)"log"(1)/([H^(+)]^(2))`
`=E^(@)+0.0591log[H^(+)]=E^(@)-0.0591pH`
`therefore0.58=0.70-0.0591pH`
or `pH=(0.12)/(0.059)=2.0`
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