EasyChemistryHigh School (11–12)Redox Reactions › Balancing Redox Equations and Redox TitrationsNumericalA-LevelAPIB
In acid, the nitrate ion is reduced to nitric oxide: NO₃⁻ → NO. Balance this half-reaction.
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
In acid, the nitrate ion is reduced to nitric oxide: . Balance this half-reaction.
Need a reminder? The key ideaShow
In acid: balance the atoms, then oxygen with , hydrogen with , and charge with electrons. In base, add to both sides to remove the . Make the electrons equal, add the halves, and cancel.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Atoms other than O and H. One nitrogen on each side. Balanced.
Step 2. Oxygen. Three on the left and one on the right. Add 2 water molecules on the right.
Step 3. Hydrogen. Two water molecules hold 4 hydrogen atoms. Add 4 on the left.
Step 4. Charge. The left side is . The right side is . Add 3 electrons on the left.
Answer: . Four , two water molecules and three electrons.
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