Redox Equations: Balancing Half Reactions

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Determining one side of a redox half-equation when the other side is known involves understanding oxidation states and charges. For example, in the transition from MnO4- to Mn2+, knowing the oxidation states of the elements is crucial. Oxygen typically has an oxidation state of -2, while halogens usually have a state of -1, although exceptions exist. The oxidation states can vary, with oxygen potentially having states of 0, +2, -1, -2, and +1, and halogens having multiple oxidation numbers. This complexity emphasizes the need for careful analysis of the compounds involved in redox reactions.
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hi,

Is there a way to figure out one side of a redox half equation when the other side is given? ex- Mn04- -> Mn2+
 
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You generally need to know the oxidation states of the atoms of the compound under consideration, but often then can be figured out if you know the oxidation state of one of the atoms and the total charge on the ion. Oxygen is always -2, for instance, and the halogens are always -1.
 
Not really.Oxygen can be 0,+2,-1,-2 and +1.Halogens can have many ON-s,the simplest case is fluorine which ALWAYS -1.

Daniel.
 

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