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Calculate the emf of half cells given be...

Calculate the emf of half cells given below:
(a) pt, `H_(2)` HCI
2 atm, `H^+` =0.02" " `E_(op)^@=o V`
(b) pt, `CI_(2)` HCI
10 atm, `CI^-=0.1` " " `E_(op)^@=-1.36` V

Text Solution

Verified by Experts

(a) `H_(2)to2H^++2e^-`
`therefore` `E_(op)=E_(op)^@=0.059/2"log"[H^+]^2/P_(H_2)`
`=0-0.059/2"log"[0.02]^2/2`
`E_(or(H_2//H^+))=+0.109` V
(b) `2CI^_toCI_(2)+2e`
`therefore` `E_(op)=E_(op)^@-0.059/2(log_10)(P_(CI_2))/[CI^-]^2`
`=-1.36-0.059/2"log"10/[0.1]^2`
`therefore` `E_(op(CI^-|CI_2))=-1.4485` V
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