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Determining an Equilibrium Constant Using Spectrophotonetry (5)

Determining an Equilibrium Constant Using Spectrophotonetry (5)

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Unformatted text preview: Pre-Laboratory Questions 1. Why must the surface oxide and dirt be removed from the surface of the meta strips to be used as electrodes? I I “‘7‘ ""C- QW'r‘P‘VL'CM’ (:u‘ Lt: ( :‘H' - . l9. - I? { . z OU/‘xd 41,4- txwrf—i a“; cam .- x .- '1 2,: .- r' 2. A nickel-cadmium battery operates with the following overall redox reaction: 2NiO(OH)(s) + Cd(s) + 2H20(I) —) 2Ni(OH)2(s) + Cd(OH)2(s) (a) Identify the species being oxidized. What is its oxidation number as a reactant and a product? CJ \9 bu” 0“ 0+ 1121 J t L’ l,.- it» "11,-“ (b) Identify the species being reduces. What is its oxidation number as a reactant and a product? N} E “ fr 1‘ it“: (c) If this battery delivers a current of 0.120 A for 10.0 minutes, what mass of Cd(s) results? ' - - . w" ‘ if 17 ‘1 (walnuts : C‘_":\,‘;“; L13? 7.: f (3’ C 1;; ‘ “If/1:. ‘ ‘ ' I» 4- I r I K— t‘ f '1,» , 9 ‘ ' .~’ ' i 1 r .r , ,- 9' ‘ . 1 'l a 9.3;,f _/ 3. The galvanic used to provide the EMF in this experiment operates with the following redox reaction: cut (aq) + Zn(s) —» Cu(s) + Zn2 ‘ (aq) g Use the following standard reduction potentials to determine the E for this cell. a Cuz‘ (aq) + 2e" h» Cu(s) E : +0337 V in an" (aq) + 2e* —~ Zn(s) E : -—0.763 V o” ‘1’ - c. i L C In I -K r ' § :3 ...
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