How to write half equations

Ionic equations are chemical equations that show only ions that participate in a chemical reaction. In other words, the ions that react together in solution and form new substances. This is very useful, particularly when dealing with redox reactions which are complicated enough without spectator ions getting in the way. In the neutralisation reaction between dilute hydrochloric acid and sodium hydroxide solution, a salt and water are formed. We can write the balanced equation for this:.
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What are ionic equations and ionic half-equations?

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What are ionic equations and ionic half-equations? -

To balance redox reactions , you must assign oxidation numbers to the reactants and products to determine how many moles of each species are needed to conserve mass and charge. First, separate the equation into two half-reactions: the oxidation portion, and the reduction portion. This is called the half-reaction method of balancing redox reactions, or the ion-electron method. Each half-reaction is balanced separately and then the equations are added together to give a balanced overall reaction.
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AS Chemistry - Redox Reactions and Group 2 Elements

Overview: This section reviews reduction-oxidation redox reactions, a common type of chemical reaction. Skills: Determining oxidation states Balancing redox reaction equations New terms: Reduction Oxidation Half-reaction Oxidation State Oxidation Number Redox reactions are reactions in which one species is reduced and another is oxidized. Therefore the oxidation state of the species involved must change. These reactions are important for a number of applications, including energy storage devices batteries , photographic processing, and energy production and utilization in living systems including humans.
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This page explains how to work out electron-half-reactions for oxidation and reduction processes which are carried out under alkaline conditions, and then how to combine them to give the overall ionic equation for the redox reaction. Combining them is easy; working them out may be more difficult than under acidic conditions. If you have come to this page directly via a search engine you should be aware that it follows-on from an introductory page on this technique. You would find it much easier to understand the current page if you read that page first.
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