To determine which element is reduced or oxidized, we must identify the changes in their oxidation states. Compare the oxidation number of the element on the reactant side and on the product side.
Remember the mnemonics:
Which element is reduced in this reaction?
Cr2O72− + 3HNO2 + 5H+ → 2Cr3+ + 3NO3− + 4H2O
Enter the chemical symbol of the element.
Frequently Asked Questions
What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the Redox Reactions concept. You can view video lessons to learn Redox Reactions. Or if you need more Redox Reactions practice, you can also practice Redox Reactions practice problems.