(A) In acidic solution, dichromate ion oxidizes oxalic acid, H 2 C 2 O 4 (aq), to...

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(A) In acidic solution, dichromate ion oxidizes oxalic acid, H2C2O4(aq), to CO2(g) in a reaction with E°cell = 1.81 V.

CrO (aq) + 3 + 3 HCO4(aq) HCO4(aq) + 8 H+ (aq) 2 Cr+ (aq) + 7 HO + 6 CO(g)

Use the value of E°cell for this reaction, together with appropriate data from Table 19.1, to determine E° for the CO2(g)/H2C2O4(aq) electrode.

Table 19.1

TABLE 19.1 Standard Reduction Potentials at 298.15 K and 1 atma Reduction Half-Cell Reaction Acidic solution

(B) In an acidic solution, O2(g) oxidizes Cr2+(aq) to Cr3+(aq). The O2(g) is reduced to H2O(l). E°cell for the reaction is 1.653 V. What is the standard electrode potential for the couple Cr3+/Cr2+?

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General Chemistry Principles And Modern Applications

ISBN: 9780132931281

11th Edition

Authors: Ralph Petrucci, Jeffry Madura, F. Herring, Carey Bissonnette

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