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How would you balance these two redox equations? Would you add a '2' in front of Pt2+ and a '2' in front of H+ ?

Equation 1

Equation 2

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1 Answer 1

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Oxidation is loss of electrons and reduction is gain of electrons,so in these equations platinum and cadmium lost 2 electrons(oxidation) which Hydrogen ions used to form Hydrogen gas(reduction).

The redox is as follows $$\ce{Pt -> Pt^{2+} + 2e-}$$ $$\ce{2H+ +2e- -> H2}$$ So the net equation is $$\ce{Pt +2H+ -> Pt^{2+} + H2}$$ You can check that out http://www.chemguide.co.uk/inorganic/redox/equations.html

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