Methods for balancing redox reactions

One thing is to determine levels of oxidation for single compounds but to be able to use the levels of oxidation in practice it is necessaiy to balance a redox-equation. The Redox reactions are often complicated and it is thereby necessary to achieve a certain routine in matching such redox equations. We first look briefly at the following redox-reaction which has to be balanced  

This reaction may be divided into the following half-reactions where the first gives the reduction and the last half-reaction gives the oxidation  

The principle in the work of progress is to balance the two half-reactions separately and add them together in order to achieve the balanced overall reaction. This we will look into in the following example  

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The method of half-reaction in acid aqueous solution 

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Separating a redox reaction into its half-reactions is useful if you need to balance the reaction. One method for balancing redox reactions is reviewed in Appendix 4. 

Only one method for balancing redox reactions, the half-equation method introduced in Chapter 4. 

Half-Reaction Method for Balancing Redox Reactions... 

Please visit http //elsevierdirect.eom/companions/9780120885305 for brief tutorials on assignment of oxidation numbers and methods for balancing redox reactions. Both skills are required for mastery of the remainder of the materials presented in this chapter. 

An alternative to the oxidation-number method for balancing redox reactions is the half-reaction method. The key to this method is to realize that the overall reaction can be broken into two parts, or half-reactions. One half-reaction describes the oxidation part of the process, and the other half-reaction describes the reduction part. Each half is balanced separately, and the two halves are then added to obtain the final equation. Let s look at the reaction of aqueous potassium dichromate (K2Cr2C>7) with aqueous NaCl to see how the method works. The reaction occurs in acidic solution according to the unbalanced net ionic equation... 

Balancing oxidation-reduction reactions depends on whether the solution is acidic or basic. The method for balancing redox reactions in an acidic solution is as follows ... 

The method for balancing redox reactions in a basic solution is as follows ... 

Oxidation-reduction reactions are often complicated, which means that it can be difficult to balance their equations by simple inspection. Two methods for balancing redox reactions will be considered here (1) the oxidation states method and (2) the half-reaction method. 

Review of Oxidation-Reduction Concepts Half-Reaction Method for Balancing Redox Reactions Electrochemical Cells... 

The half-reaction method for balancing redox reactions divides the overall redox reaction into oxidation and reduction half-reactions. Each half-reaction is balanced for atoms and charge. Then, one or both are multiplied by some integer to make electrons gained equal electrons lost, and the half-reactions are recombined to give the balanced redox equation. The half-reaction method is commonly used for studying electrochemistry because... 

What is a half-reaction Why must the number of electrons lost in the oxidation half-reaction equal the number of electrons gained in the reduction half-reaction Summarize briefly the steps in the half-reaction method for balancing redox reactions. What two items must be balanced in a redox reaction (or any reaction) ... 

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