CH21_echem_prob

CH21_echem_prob - Extra Problems for Chapters 21 1. Balance...

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Extra Problems for Chapters 21 1. Balance the following equations by the half-reaction method. a) acidic: Hg 2 HPO 4 ( s ) + Au( s ) + Cl ( aq ) Hg( l ) + H 2 PO 4 ( aq ) + AuCl 4 ( aq ) [3,2,8,3H + =6,3,2] b) basic: Ag 2 S( s ) + Cr(OH) 3 ( s ) Ag( s ) + HS ( aq ) + CrO 2 4 ( aq ) [3,2,7OH =6,3,2,5H 2 O] c) HNO 2 NO 3 + NO [3=1,2,H + ,H 2 O]
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-2- 2. What reaction occurs when the standard hydrogen electrode functions as a) an anode? [H 2 ( g ) 2H + ( aq ) + 2 e ] b) a cathode? c) What does standard mean here? 3. A zinc electrode immersed in 1 M zinc chloride is connected to a standard hydrogen elec- trode employing a salt bridge. The zinc electrode is observed to dissolve and a cell voltage of 0.763 V is recorded. a) Give the balanced cell reaction. b) What is E o (Zn 2 + |Zn)? [-0.763 V] 4. A half cell constructed from a silver electrode surrounded by 1 M AgNO 3 is connected to a standard hydrogen electrode using a salt bridge. The cell voltage is observed to be 0.800 V while metallic silver plates out.
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CH21_echem_prob - Extra Problems for Chapters 21 1. Balance...

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