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when doing redox reactions it is most important to make sure the equation is balanced. First balance the important element. Then balance oxygens with H2O. and depending on if it is in an acidic or basic solution, balance hydrogens with H+ or H+ and OH-. you may put coefficients in front of everything
For an acidic solution, balance oxygen with water molecules and balance hydrogen with H+. For a basic solution, balance oxygen with water molecules, and balance the hydrogen from those water molecules with water molecules on the other side of the equation. Then, balance oxygen with OH- on the first side of the equation.
for a acidic solution you should begin by balancing the non hydrogen and oxygen elements. Once you have done this you should balance the oxygen by adding H2O to the side that is lacking oxygen. Then you would add H+ to the other side to balance the number of hydrogen molecules.
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