Exercise




Exercise
Exercise -  Balance the following redox equations for reactions run in basic conditions. (The answers are at the bottom of this page.)

a. CrO42-(aq)  +  S2-(aq)  -->  Cr(OH)3(s)  +  S(s)

b. MnO4-(aq)  +  I-(aq)  -->  MnO2(s)  +  IO3-(aq)

c. H2O2(aq)  +  ClO4-(aq)  -->  O2(g)  +  ClO2-(aq)

d. S2-(aq)  +  I2(s)  -->  SO42-(aq)  +  I-(aq)

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Answers

a. 2CrO42-(aq) + 3S2-(aq) + 8H2O(l)
                           
  -->
  2Cr(OH)3(s) + 3S(s) + 10 OH-(aq)

b. 2MnO4-(aq) + I-(aq) + H2O(l) 
                           
 -->
  2MnO2(s) + IO3-(aq) + 2OH-(aq)

c. 2H2O2(aq) + ClO4-(aq)  -->  2O2(g) + ClO2-(aq) + 2H2O(l)

d. S2-(aq) + 4I2(s) + 8OH-(aq)  -->  SO42-(aq) + 8I-(aq) + 4H2O(l)

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