A redox reaction is also known as a reduction-oxidation reaction. Often, these reactions take place in acidic solutions, although sometimes they can also occur in basic solutions.
A redox reaction is commonly known as a reduction-oxidation process. These reactions often take place in acidic solutions and occasionally occur in solutions that are basic. Balancing a redox reaction in a basic solution can easily be done using the half-reaction method. To understand this in detailed form, let's start with its basics.
Balancing of redox reactions happens in two categories. If the solution is acidic, it is treated differently, and if basic, the process of balancing may vary.
Balancing redox reactions in a basic solution is slightly more difficult than the balancing redox reactions in an acidic solution. In the basic solution, we add up H+ and OH- in every half-equation.
To balance the redox reaction in a basic medium, OH ions and water are added to half of the reactions.
Take the reaction between potassium permanganate and sodium sulfite, for example:
MnO4– + SO32- + H2O → MnO2 +SO42- + OH–
The imbalanced reaction can be divided into two half-reactions, each representing either reduction or oxidation, just as it can in acidic media.
Reduction: 3 e− + 2 H2O + MnO4− → MnO2 + 4 OH−
Oxidation: 2 OH− + SO32− → SO42− + H2O + 2 e−
When the number of electrons in the two half-reactions are balanced, the result is:
6 e− + 4 H2O + 2 MnO4− → 2 MnO2 + 8 OH−
6 OH− + 3 SO32− → 3 SO42− + 3 H2O + 6 e−
The balanced equation is obtained by adding these two half-reactions together:
2 MnO4– + 3 SO32- + H2O → 2 MnO2 + 3 SO42- + 2 OH–
1. How do you balance a redox reaction by the half-reaction method?
2. How do you balance redox reactions by the ion-electron method in a basic medium?
3. How do you balance half equations?
Balancing half equations can be done by balancing the atoms separately. The number of electrons lost is equalized to the number of electrons gained.
4. What is step 1 in the ion-electron method for balancing redox reactions?
Writing down the unbalanced equations and then separating the reactions into two halves as per their undergoing process.
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