Tollen's reagent is used for the detection of aldehyde. When a solution of AgNO_(3) is added to glucose with NH_(4)OH, then gluconic acid is formed. Ag^(+)toe^(-)toAg,E_(red)^(@)=0.8V C_(6)H_(12)O_(6)+H_(2)OtoC_(6)H_(12)O_(7) (Gluconic acid) +2H^(+)+2e^(-),E_(oxd)^(@)=-0.05V Ag(NH_(3))_(2)^(+)+e^(-)toAg(s)+2NH_(3),E^(@)=-0.337V [Use 2.303xx(RT)/(F)=0.0592 and (F)/(RT)=38.92 at 298K] Now answer the following three questions: Q. When ammonia is added to the solution, pH is raised to 11. Which half-cell reaction is affected by pH and by how much:

Tollen's reagent is used for the detection of aldehyde. When a solutio

1.	Tollen's reagent is used for the detection of aldehyde. When a solution of AgNO_(3) is added to glucose with NH_(4)OH, then gluconic acid is formed. Ag^(+)toe^(-)toAg,E_(red)^(@)=0.8V C_(6)H_(12)O_(6)+H_(2)OtoC_(6)H_(12)O_(7) (Gluconic acid) +2H^(+)+2e^(-),E_(oxd)^(@)=-0.05V Ag(NH_(3))_(2)^(+)+e^(-)toAg(s)+2NH_(3),E^(@)=-0.337V [Use 2.303xx(RT)/(F)=0.0592 and (F)/(RT)=38.92 at 298K] Now answer the following three questions: Q. When ammonia is added to the solution, pH is raised to 11. Which half-cell reaction is affected by pH and by how much:
Answer» `E_(oxd)` will INCREASE by a FACTOR of 0.65 for `E_(oxd)^(@)` `E_(oxd)` will decrease by a factor of 0.65 for `E_(oxd)^(@)` `E_(RED)` will increase by a factor of 0.65 for `E_(red)^(@)` `E_(red)` will decrease by a factor of 0.65 for `E_(red)^(@)` SOLUTION :`[H^(+)]=10^(-11)M` `E_("oxide")=-0.05-(0.591)/(2)log(10^(-11))^(2)=-0.05+0.65` or `triangleH=0.65` volt.