BRAINCAKERedox Reactions in Aqueous Solutions
Some species in aqueous solutions are neither oxidised or reduced. These include water molecules H2O and hydrogen ions H+ in acidic solutions and hydroxide ions OH-in alkaline solutions. They should be balanced separately.
For example:
unbalanced MnO4- in acidic solution where MnO4- is reduced to Mn2+
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Key terms in this lesson
- Oxidation
- The addition of oxygen, the removal of hydrogen, the loss of electrons, or an increase in oxidation number.
- Oxidation number
- A number that represents the number of electrons an atom has lost or gained, or would do if the compound were fully ionic.
More in Oxidation and Reduction
- Rules for Oxidation State
- Working Out Oxidation States
- Superoxide
- Redox Equations
- Thermite Reaction
- Half Equations from Ionic Equations
- Exam Style Question - 1
- Exam Style Question - 2
All 15 lessons in Oxidation and Reduction · All AQA AS-level Chemistry topics