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Nernst equation gives the variation of p...

Nernst equation gives the variation of potential of an electrode based on activity of ions temperature and pressure. The equation is
`E=E^(@) -(2.303RT)/(nF) logQ (or) E=E^@ - (0.0591)/(n) log Q `
`E^@`= Standard potential and 'Q' is the reaction quotient.
What is the reduction potential of a hydrogen electrode in an aqueous solution containing 0.1 M `NH_4OH,(Kb=10^(-5))`, ?

A

0.02 V

B

0.03 V

C

0.06 V

D

0.01 V

Text Solution

Verified by Experts

The correct Answer is:
A
`E_1 = E^(0) + (0.06)/(3) logC , E_2 = E^(0) +(0.06)/(3) log ((C)/(10))`
` (E_2 -E_1) = (0.06)/(3) [log""((C)/(60))-logC] = 0.02 log((C)/(10) xx (1)/(C)) = 0.02 xx log 10^(-1) = -0.02V`
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