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20 Electrochemistry Solutions to Exercises (b) The standard reduction potential of a half-reaction is determined by combining it with a reference half-reaction of known potential and measuring the cell potential. Assuming the half-reaction of interest is the reduction half-reaction: = (cathode) (anode) = (unknown) - (reference); 20.35 Analyze/Plan. Follow the logic in Sample Exercise 20.5. Solve. (a) The two half-reactions are: anode (b) (c) V Anode (-) Cathode (+) Inert Inert Electrode (Pt) Salt Electrode (Pt) Bridge Solution Contains anions Solution Contains cations Note that because Cr²⁺(aq) is readily oxidized, it would be necessary to keep oxygen out of the left-hand cell compartment. 20.36 (a) cathode anode V (b) (c) V Anode (-) Cathode (+) Cd Pd Salt Bridge Solution Contains anions Solution Contains Cd²⁺(aq) cations 621