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Li, „CoO, is an anode for lithium batteries. Cobalt is present as a mixture of Co(III) and Co(II). Most preparations also contain inert lithium salts and moisture. To find the stoichiometry, Co was measured by atomic absorption and its average oxidation state was measured by a potentiometric titration.43 For the titration, 25.00 mg of solid were dissolved under N, in 5.000 mL containing 0.1000 M Fe2+ in 6 M H,SO, plus 6 M H, PO, to give a clear pink solution: Co+ + Fe2+ - Co2+ + Fe3+ Unreacted Fe2+ required 3.457 mL of 0.01487 M K,Cr,0, for complete titration. How many mmol of Co³ + are contained in 25.00 mg of the material? mmol of Co3 + mmol Atomic absorption found 56.4 wt% Co in the solid. What is the average oxidation state of Co? average oxidation state of Co: Find y in the formula Li, 4COO,. y = What is the theoretical quotient wt% Li/wt% Co in the solid? wt% Li wt% Co The observed quotient, after washing away inert lithium salts, was 0.1388 ± 0.0006. Is the observed quotient consistent with the average cobalt oxidation state? O yes no

Li, „CoO, is an anode for lithium batteries. Cobalt is present as a mixture of Co(III) and Co(II). Most preparations also contain inert lithium salts and moisture. To find the stoichiometry, Co was measured by atomic absorption and its average oxidation state was measured by a potentiometric titration.43 For the titration, 25.00 mg of solid were dissolved under N, in 5.000 mL containing 0.1000 M Fe2+ in 6 M H,SO, plus 6 M H, PO, to give a clear pink solution: Co+ + Fe2+ - Co2+ + Fe3+ Unreacted Fe2+ required 3.457 mL of 0.01487 M K,Cr,0, for complete titration. How many mmol of Co³ + are contained in 25.00 mg of the material? mmol of Co3 + mmol Atomic absorption found 56.4 wt% Co in the solid. What is the average oxidation state of Co? average oxidation state of Co: Find y in the formula Li, 4COO,. y = What is the theoretical quotient wt% Li/wt% Co in the solid? wt% Li wt% Co The observed quotient, after washing away inert lithium salts, was 0.1388 ± 0.0006. Is the observed quotient consistent with the average cobalt oxidation state? O yes no

Chemistry
Chemistry
10th Edition
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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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Li, „Coo, is an anode for lithium batteries. Cobalt is present as a mixture of Co(III) and Co(II). Most preparations also contain inert lithium salts and moisture. To find the stoichiometry, Co was measured by atomic absorption and its average oxidation state was measured by a potentiometric titration.43 For the titration, 25.00 mg of solid were dissolved under N, in 5.000 mL containing 0.1000 M Fe2 + in 6 M H, SO, plus 6 M H, PO, to give a clear pink solution: Co³+ + Fe?+ → Co2+ + Fe3+ Unreacted Fe2+ required 3.457 mL of 0.01487 M K,Cr,O, for complete titration. How many mmol of Co3 + are contained in 25.00 mg of the material? mmol of Co3 + = mmol Atomic absorption found 56.4 wt% Co in the solid. What is the average oxidation state of Co? average oxidation state of Co: Find y in the formula Li 4COO2. y = What is the theoretical quotient wt% Li/wt% Co in the solid? wt% Li wt% Co The observed quotient, after washing away inert lithium salts, was 0.1388 ± 0.0006. Is the observed quotient consistent with the average cobalt oxidation state? O yes no Ouestion Source: Ouantitative Chemical Analvsis 43. S. Scaccia and M. Carewska, “Determination of Stoichiometry of Li, Coo, Materials by Flame Atomic Absorption Spectrometry and Automated Potentiometric Titration," Anal. Chim. Acta 2002, 453, 35. please answer all parts
Transcribed Image Text:Li, „Coo, is an anode for lithium batteries. Cobalt is present as a mixture of Co(III) and Co(II). Most preparations also contain inert lithium salts and moisture. To find the stoichiometry, Co was measured by atomic absorption and its average oxidation state was measured by a potentiometric titration.43 For the titration, 25.00 mg of solid were dissolved under N, in 5.000 mL containing 0.1000 M Fe2 + in 6 M H, SO, plus 6 M H, PO, to give a clear pink solution: Co³+ + Fe?+ → Co2+ + Fe3+ Unreacted Fe2+ required 3.457 mL of 0.01487 M K,Cr,O, for complete titration. How many mmol of Co3 + are contained in 25.00 mg of the material? mmol of Co3 + = mmol Atomic absorption found 56.4 wt% Co in the solid. What is the average oxidation state of Co? average oxidation state of Co: Find y in the formula Li 4COO2. y = What is the theoretical quotient wt% Li/wt% Co in the solid? wt% Li wt% Co The observed quotient, after washing away inert lithium salts, was 0.1388 ± 0.0006. Is the observed quotient consistent with the average cobalt oxidation state? O yes no Ouestion Source: Ouantitative Chemical Analvsis 43. S. Scaccia and M. Carewska, “Determination of Stoichiometry of Li, Coo, Materials by Flame Atomic Absorption Spectrometry and Automated Potentiometric Titration," Anal. Chim. Acta 2002, 453, 35. please answer all parts
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