Potassium dichromate is used to titrate a sample containing an unknown percentage of iron (AW. 55.845 g/mol ). The sample is dissolved in H3PO4/H2SO4 mixture reduce all of the iron to Fe<* ions. The solution is then titrated with 0.01625 M K2Cr207, producing Fe* and Cr* ions in acidic solution. The titration requires 32.26 mL of K2Cr207 for 1.2765 g of the sample.

Potassium dichromate is used to titrate a sample containing an unknown percentage of iron (AW. 55.845 g/mol ). The sample is dissolved in H3PO4/H2SO4 mixture reduce all of the iron to Fe<* ions. The solution is then titrated with 0.01625 M K2Cr207, producing Fe* and Cr* ions in acidic solution. The titration requires 32.26 mL of K2Cr207 for 1.2765 g of the sample.

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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Question

Potassium dichromate is used to titrate a sample containing an unknown percentage of iron (AW. 55.845 g/mol ). The sample is dissolved in H3PO4/H2SO4 mixture to
reduce all of the iron to Fe2* ions. The solution is then titrated with 0.01625 M K2Cr207, producing Fes+
mL of K2Cr207 for 1.2765 g of the sample.
and Cro+ ions in acidic solution. The titration requires 32.26
6F22+ + Cr2072- + 14H* .
---> 6 Fe3+ + 2Cr3+
7H2O
+
Determine the percent iron in the sample.
13.76%
12.13%
15.48%
14.92%

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