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CBSE Class 11-science Answered

What are the steps involved in balancing a Redox equation by oxidation number method?
Asked by Topperlearning User | 13 Jun, 2016, 04:45: PM
answered-by-expert Expert Answer

Step - I Write the skeletal equation of all the reactants and products of the reaction.
Step - II Indicate the Oxidation number of each element.
Step - III Calculate the increase or decrease in oxidation number per atom and identify the oxidizing and reducing agents.
Step - IV Multiply the formulae of the oxidizing and reducing agents by suitable integers so as to equalize the total increase or decrease in oxidation number as calculated in Step - III
Step - V Balance all atoms other than Hydrogen and Oxygen.
Step - VI Finally balance Hydrogen and Oxygen atoms by adding H2O molecules using hit and trial method.
Step - VII In case of ionic reaction a) for acidic medium, first balance oxygen atoms by adding water molecules to whatever side deficient in oxygen atoms and then balance hydrogen atoms by adding H+ ions to whatever side deficient in hydrogen atoms b) for basic mediums, first balance oxygen atoms by adding water molecules to whatever side deficient in oxygen atoms the hydrogen atoms are then balanced by adding water molecules equal in number to the deficiency of hydrogen atoms and en equal number of OH- ions are added to the opposite side of the equation.

Answered by | 13 Jun, 2016, 06:45: PM
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