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Tollen's reagent is used for the detecti...

Tollen's reagent is used for the detection of aldehyde when a solution of `AgNO_3` is added to gluose with `NH_4OH` then gluconic acid is formed
`Ag^(+) + e^(-) to ag, E_(1)^(@) = 0.8 V , C_6H_(12)O_6 + H_2O to "Gluconic acid "`
`(C_6 H_(12)O_7) + 2H^(+) + 2e^(-) , E_(2)^(@) = -0.05 V , [Ag(NH_3)_2]^(+) e^(-) to Ag(s) + 2NH_3`,
[Use , `2.303 xx (RT)/(F) = 0.0592 and (F)/(RT) = 38.92 "at " 298 K`]
`2Ag^(+) + C_6H_(12)O_(6) + H_2O to 2Ag(s) + C_(6) H_(12)O_(7) + 2H^(+)` . Find `log_(10)K ` of this reaction :

A

`12.7`

B

`25.33 `

C

`28.30`

D

`46.29`

Text Solution

Verified by Experts

The correct Answer is:
B
`Ag^(oplus) + 1 e^(-) to Ag , 0.8 xx 1 , G + H_2O to G.A + 2H^(oplus) + 2e^(-) ,(-0.05 xx 2)`
` 2Ag^(oplus) + G + H_2O to 2Ag + G.A + 2H^(oplus) , (E^(0) xx 2) , 2 xx E^(0) = (0.05 xx 2) + (0.8 xx 1 xx 2) `
` E^(0) = (0.8 -0.05) = 0.75 , E^(0) = 0.75 V , ` But ` E^0 = (0.0591)/(n) log""K_(c) , 0.75 = (0.0591)/(2) log K_(c)`
` log K_(c)((0.75 xx 2)/(0.0591)) , log K_c = 25.38`
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