Problem #4 - Redox in Acidic Solution, Overall Result

Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!

Balance the following redox equation in acidic solution
Cr2O72- + C2H4O → C2H4O2 + Cr3+

H+ + Cr2O72- + C2H4O → C2H4O2 + Cr3+ + H2O