Question

Balance the redox equation for the oxidation of p-xylene to terephthalic acid using H2CrO4:


Balance the redox equation for the oxidation of p-xylene to terephthalic acid using H2CrO4

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How many milligrams of H2CrO4 are required to oxidize 75.0 mg of p-xylene to terephthalic acid? 

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Answer #1

Oxidation half reaction

p-xylene + H2O terephthalic acid + 6 H+ + 6 e-

Reduction half-reaction

H2CrO4 + 6 H+ + 3 e- Cr3+ + 4 H2O

Total reaction

C8H10 + 2 H2CrO4 + 6 H+ C8H6O + 2 Cr3+ + 7 H2O

milligrams of H2CrO4 = 1.67 x 103 mg (or 167 mg)

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