To balance the chemical equation for the oxidation of ethanol to acetic acid using potassium dichromate as the oxidizing agent in acidic medium, we need to follow these steps:1. Write the unbalanced equation:C2H5OH + K2Cr2O7 CH3COOH2. Balance the atoms other than hydrogen and oxygen:C2H5OH + K2Cr2O7 2CH3COOH3. Balance the oxygen atoms by adding water molecules:C2H5OH + K2Cr2O7 2CH3COOH + H2O4. Balance the hydrogen atoms by adding protons H+ :C2H5OH + K2Cr2O7 + 4H+ 2CH3COOH + H2O5. Balance the charge by adding electrons e- :C2H5OH + K2Cr2O7 + 4H+ + 6e- 2CH3COOH + H2O6. Balance the chromium atoms by adding Cr3+ ions:C2H5OH + K2Cr2O7 + 4H+ + 6e- 2CH3COOH + H2O + 2Cr3+Now the balanced chemical equation is:C2H5OH + K2Cr2O7 + 4H+ + 6e- 2CH3COOH + H2O + 2Cr3+