ch14 examples part 2

# ch14 examples part 2 - Problem Determine the oxidation...

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1 Problems in the slides of Chapter 14: Part 2 --- Problem ¾ Determine the oxidation number of S in H 2 S O 4 ± Oxidation number of H 2 SO 4 is 0 (because H 2 SO 4 has no charge) ± Oxidation state of H 1+ ± Oxidation state of O 2 - - Set up an equation to solve for the unknown 2 ( +1 ) + x + 4 ( -2 ) = 0 ± Solve for x ± 2 + x -8 = 0 ± x= 6 ± (Therefore, the oxidation number of S in the compound is 6+) ¾ --------------------- Problem ¾ Evaluate the oxidation number of N in AgNO 3 ± The compound has not charge, therefore its oxidation number is 0 ± The oxidation number of O is 2- ± the oxidation number of Ag is 1+ Because, in the compound, Ag has a charge of +1 (Examine ionization reaction of the compound) AgNO 3 -> Ag + + NO 3 - ¾ Setup an equation to solve the oxidation number of the unknown ± Let x denote the oxidation number of N in the compound ± 0 = +1 + x +3 ( -2 ) ± 0 = +1 + x -6 ± x = 5 (Therefore, the oxidation number of N in the compound is 5+) ¾ -- Is the following a redox reaction? 2 Pb + O 2 -> 2 PbO (lead oxide) ¾ Start with determining the oxidation states (or numbers) of the elements in the reaction: ¾ Reactants: Pb 0 , O 0 (oxidation number of uncombined elements is 0) ¾ Product ± The total charge of PbO is 0 ± (oxidation number of an uncharged compound is 0) ± Oxidation number of O in a compound is 2- ¾ Setup an equation to solve for the unknown ± Let x denote the oxidation number of Pb in PbO ± x -2 = 0 ± x = 2

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ch14 examples part 2 - Problem Determine the oxidation...

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