Question

H2O2(aq) --> H2O(l) + O2(g)

1. identify half rxns and overall balanced equation.

2. what is E° of the cell?

3. [H2O2] = 0.2 M, Po=0.21 atm, other species still have concentration of 1.0 M. What is cell potential?

Answer 1

These questions are solved as follows:

H2O2 (a) H20(4)+02C) p f dispropertienation there cccurs a hed hove Aon is an het ft idetfy ahene wilion &Cohere ox ation ws exiddation tate C Oin H,0, 2 t 2%= O =-2 ot 2 2 Criddation state O in H20 -2 Orielalion tate of 0in 2 X = 0 Cat cathede) Reductia to H20 Cat anode) Occidolian OR idation (-2) O2(9) H20() Reduction Oxidatien + 2 O2 t 2Ht H202 at Ane de Redrution 2H20 at Cathode O2 t 2H20 overall n cell = Standard EMf os CE) GeEhade Sol/2 Eanade 1Guen Data s aceh herpect to reduelio

for anede H2O2 +2HT t 2 HO2 Cag) Eicv)- 0.70V 2H2OCA) Ev)-1.78 V Or for cathode, H2 O Car) + 2 Ht Ca)t 2 .' 1.78-0.7oV 1.08 V oli3 Coe are TH,023= Concentraan is 1.om 0.2 MPo. = 0.21 atm& fer ther peaeies ERHST :. Cell Paletial O,0591 oTTH,0T [M20212 Co21) (1) (o 2)2 g(5.25) O0591 - 108 O.02955 e 108 108-0.02955 O.02955 1.08 = 108-0 0212806 XO.720159 Ecle10587194 Ecele 1 06 V