*SHOW COMPLETE SOLUTION* A 4.971g sample containing the mineral tellurite was dissolved and then treated with 50.00mL of 0.03114M K2Cr2O7: 3TeO2 + Cr2O7-2 + 8H+ → 3H2TeO4 + 2Cr+3 + H2O When the reaction is complete, the excess Cr2O7-2 required a 10.05mL back-titration with 0.1135M Fe2+. Calculate the percentage of TeO2 (MM 159.6) in the sample. 6Fe+2 + Cr2O7-2 + 14H+ → 6Fe+3 + 2Cr+3 + 7H2O Answer: 13.17% TeO2
*SHOW COMPLETE SOLUTION* A 4.971g sample containing the mineral tellurite was dissolved and then treated with 50.00mL of 0.03114M K2Cr2O7: 3TeO2 + Cr2O7-2 + 8H+ → 3H2TeO4 + 2Cr+3 + H2O When the reaction is complete, the excess Cr2O7-2 required a 10.05mL back-titration with 0.1135M Fe2+. Calculate the percentage of TeO2 (MM 159.6) in the sample. 6Fe+2 + Cr2O7-2 + 14H+ → 6Fe+3 + 2Cr+3 + 7H2O Answer: 13.17% TeO2
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
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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*SHOW COMPLETE SOLUTION*
A 4.971g sample containing the mineral tellurite was
dissolved and then treated with 50.00mL of 0.03114M
K2Cr2O7:
3TeO2 + Cr2O7-2 + 8H+ → 3H2TeO4 + 2Cr+3 + H2O
When the reaction is complete, the excess Cr2O7-2 required a 10.05mL back-titration with 0.1135M Fe2+. Calculate the percentage of TeO2 (MM 159.6) in the sample.
6Fe+2 + Cr2O7-2 + 14H+ → 6Fe+3 + 2Cr+3 + 7H2O
Answer: 13.17% TeO2
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