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The powerful oxidizing agent Ce(V) can be used to quantitatively determine the concentration of methylmalonic acid (MEMA) in a 500 mL beaker. The reaction proceeds as follows: CH;CH(COOH)2 + 6Ce(IV)+ 2H,0 CH;COOH + 6Ce() • 6H + 2CO, If the initial concentration of CelIV) in the beaker was 03M, and 20.0 mL of 05 M Fe was required to back-titrate the excess Ce(IV), what was the concentration of MeMA initially present? O A.0047 M O B.0.28 M O C.0.020 M D.0.023 M

The powerful oxidizing agent Ce(V) can be used to quantitatively determine the concentration of methylmalonic acid (MEMA) in a 500 mL beaker. The reaction proceeds as follows: CH;CH(COOH)2 + 6Ce(IV)+ 2H,0 CH;COOH + 6Ce() • 6H + 2CO, If the initial concentration of CelIV) in the beaker was 03M, and 20.0 mL of 05 M Fe was required to back-titrate the excess Ce(IV), what was the concentration of MeMA initially present? O A.0047 M O B.0.28 M O C.0.020 M D.0.023 M

Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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A cerium(IV) oxidation The powerful oxidizing agent Ce(IV) can be used to quantitatively determine the concentration of methylmalonic acid (MEMA) in a 500 mL beaker. The reaction proceeds as follows: CH;CH(COOH), 6Ce(IV) + 2H,0 - CH;COOH + 6Ce(l) 6H 2CO, 14 If the initial concentration of CelIV) in the beaker was 0.3M, and 20.0 mL of OSM Fe?* was required to back-titrate the excess Ce(IV), what was the concentration of MeMA initially present? A.0 047 M B. 0.28 M C.0.020 M O D.0.023M
Transcribed Image Text:A cerium(IV) oxidation The powerful oxidizing agent Ce(IV) can be used to quantitatively determine the concentration of methylmalonic acid (MEMA) in a 500 mL beaker. The reaction proceeds as follows: CH;CH(COOH), 6Ce(IV) + 2H,0 - CH;COOH + 6Ce(l) 6H 2CO, 14 If the initial concentration of CelIV) in the beaker was 0.3M, and 20.0 mL of OSM Fe?* was required to back-titrate the excess Ce(IV), what was the concentration of MeMA initially present? A.0 047 M B. 0.28 M C.0.020 M O D.0.023M
Reduction Potentials of Metal lon Complexes Metal ions in a high oxidation state are often found complexed to anions in solution as opposed to being "naked" aquo ions. For example, complexation of Ce with the perchlorate anion CIO, shifts the standard reduction potential of Ce*|Ce3+ from 1.47 to 1.70 V in acidic solution. In marine environments, trace levels of Fe are scavenged by microbially produced catecholates such as enterobactin. The (Fe(catecholz complex is calculated to shift the Fe"IFE2" reduction potential from 0.771 to as low as -2.55 V (see Rizvi et al, Monatsh Chem 2017). What can be said about the interactigns between perchlorate, catecholate and their respective metal lons? O A Perchlorate stabilizes Ce and catecholate stabilizes Fe? O B. Perchlorate stabilizes Ce and catecholate stabilizes Fe O C. Perchlorate stabilizes Ce* and catecholate stabilizes Fe D. Perchlorate stabilizes Ce* and catecholate stabilizes Fe?
Transcribed Image Text:Reduction Potentials of Metal lon Complexes Metal ions in a high oxidation state are often found complexed to anions in solution as opposed to being "naked" aquo ions. For example, complexation of Ce with the perchlorate anion CIO, shifts the standard reduction potential of Ce*|Ce3+ from 1.47 to 1.70 V in acidic solution. In marine environments, trace levels of Fe are scavenged by microbially produced catecholates such as enterobactin. The (Fe(catecholz complex is calculated to shift the Fe"IFE2" reduction potential from 0.771 to as low as -2.55 V (see Rizvi et al, Monatsh Chem 2017). What can be said about the interactigns between perchlorate, catecholate and their respective metal lons? O A Perchlorate stabilizes Ce and catecholate stabilizes Fe? O B. Perchlorate stabilizes Ce and catecholate stabilizes Fe O C. Perchlorate stabilizes Ce* and catecholate stabilizes Fe D. Perchlorate stabilizes Ce* and catecholate stabilizes Fe?
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