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19 Nov 2019
097 v 0.79 V 1.12 V 1.00 V 1.59 v .77 V 0.27 V NO *NO, al-NO , a NO -> N,0 , NH, 1.25V 0.9 An arrow represents the "properly balanced reduction half-reaction" between the oxidized species on the left and the reduced species on the right of the arrow. The potential value over each arrow is the standard reduction potential And for that properly balanced half-reaction. For example, from this diagram, you can write NO: (a) + + 2 H(ag) NO2g) + HOI): Ented = +0.79 v (R) (18 pts) When HSEis bubbled into nitric acid solutionss(s), NO(R) NOR)Na(R, and NH (ag) all form. (a) (8 pts) write the four balanced reactions that describe this complex process. (b) (8 pts) For each reaction in part (a), calculate the standard emf (in V. (c) (2 pts) Which of the four reactions has the greatest driving force and which has the least driving force per electron? (2) (16 pts) Use the Latimer diagram above for this question. (a) (6 pts) NOgdisproportionates spontaneously into nitric acid and nitrous acid in acidic media. Show this by writing the balanced chemical reaction and evaluating the standard emf for the reaction. (b) (6 pts) Nitrous acid will not disproportionate spontaneously to nitrogen dioxide and nitric oxide, Show this by writing the balanced chemical reaction and evaluating the standard emf for the reaction. (c) (4 pts) Given that the definition of Ivolt - 1 jouleleoul lomb, show that the reduction of the nitrate ion to nitrogen gas in acidic media has a standard reduction potential of +1.25 v. (3) (6 pts) Active metals like zinc will react with concentrated nitric acid to produce the ammonium ion and the Zn (aq) ion at 25°C. (a) (4 pts) write the balanced chemical equation for this process using smallest whole number coefficients. (b) (2 pts) Evaluate AE (V) for the reaction in part (a). (4) (6 pts) Less active metals like copper will react with concentrated nitric acid to produce nitric oxide gas and the Cu *(a) ion at 25°C. (®) (4 pts) write the balanced chemical equation for this process using smallest whole number coefficients. (b) (2 pts) Evaluate AE for the reaction in part (a). BONUS (8 pts, and PRACTICE): Write all balanced half-reactions indicated by the Latimer diagram above.
097 v 0.79 V 1.12 V 1.00 V 1.59 v .77 V 0.27 V NO *NO, al-NO , a NO -> N,0 , NH, 1.25V 0.9 An arrow represents the "properly balanced reduction half-reaction" between the oxidized species on the left and the reduced species on the right of the arrow. The potential value over each arrow is the standard reduction potential And for that properly balanced half-reaction. For example, from this diagram, you can write NO: (a) + + 2 H(ag) NO2g) + HOI): Ented = +0.79 v (R) (18 pts) When HSEis bubbled into nitric acid solutionss(s), NO(R) NOR)Na(R, and NH (ag) all form. (a) (8 pts) write the four balanced reactions that describe this complex process. (b) (8 pts) For each reaction in part (a), calculate the standard emf (in V. (c) (2 pts) Which of the four reactions has the greatest driving force and which has the least driving force per electron? (2) (16 pts) Use the Latimer diagram above for this question. (a) (6 pts) NOgdisproportionates spontaneously into nitric acid and nitrous acid in acidic media. Show this by writing the balanced chemical reaction and evaluating the standard emf for the reaction. (b) (6 pts) Nitrous acid will not disproportionate spontaneously to nitrogen dioxide and nitric oxide, Show this by writing the balanced chemical reaction and evaluating the standard emf for the reaction. (c) (4 pts) Given that the definition of Ivolt - 1 jouleleoul lomb, show that the reduction of the nitrate ion to nitrogen gas in acidic media has a standard reduction potential of +1.25 v. (3) (6 pts) Active metals like zinc will react with concentrated nitric acid to produce the ammonium ion and the Zn (aq) ion at 25°C. (a) (4 pts) write the balanced chemical equation for this process using smallest whole number coefficients. (b) (2 pts) Evaluate AE (V) for the reaction in part (a). (4) (6 pts) Less active metals like copper will react with concentrated nitric acid to produce nitric oxide gas and the Cu *(a) ion at 25°C. (®) (4 pts) write the balanced chemical equation for this process using smallest whole number coefficients. (b) (2 pts) Evaluate AE for the reaction in part (a). BONUS (8 pts, and PRACTICE): Write all balanced half-reactions indicated by the Latimer diagram above.