Answer to Question #201165 in Chemistry for Mark

Question #201165

Balance the reactions below using the change in oxidation number method

1.     PbO2 + HBr – PbBr2 + O2 + H2O

2.     KBr + KClO2 + H2SO4 – Br2 + KCl + K2SO4 + H2O


1
Expert's answer
2021-06-07T03:23:39-0400

The balanced reactions are:

1.     2PbO2 + 4HBr –> 2PbBr2 + O2 + 2H2O

Pb: reduced, gained two electrons, Pb4+ --> Pb2+

O: oxidized, lost two electrons, O2- --> O0


2.     4KBr + KClO2 + 2H2SO4 –> 2Br2 + KCl + 2K2SO4 + 2H2O

Cl: reduce, gained four electrons, Cl3+ --> Cl1-

Br: oxidized, lost one electron, Br1- --> Br0

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