A solution of iron(II) sulfate was prepared by dissolving 10.00 g of FeSO4•7H2O (FW = 277.9) in water and diluting up to a total volume of 250 mL. The solution was left to stand, exposed to air, and some of the iron(II) ions became oxidized to ron(III) ions. A 25.0 mL sample of this partially oxidized solution required 23.70 mL of 0.0100 M potassium dichromate K2Cr2O7 solution for complete reaction in the presence of dilute sulfuric acid. Calculate the percentage of iron(II) ions that had been oxidized by the air.
A solution of iron(II) sulfate was prepared by dissolving 10.00 g of FeSO4•7H2O (FW = 277.9) in water and diluting up to a total volume of 250 mL. The solution was left to stand, exposed to air, and some of the iron(II) ions became oxidized to ron(III) ions. A 25.0 mL sample of this partially oxidized solution required 23.70 mL of 0.0100 M potassium dichromate K2Cr2O7 solution for complete reaction in the presence of dilute sulfuric acid. Calculate the percentage of iron(II) ions that had been oxidized by the air.
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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A solution of iron(II) sulfate was prepared by dissolving 10.00 g of FeSO4•7H2O (FW = 277.9) in water and diluting up to a total volume of 250 mL. The solution was left to stand, exposed to air, and some of the iron(II) ions became oxidized to ron(III) ions. A 25.0 mL sample of this partially oxidized solution required 23.70 mL of 0.0100 M potassium dichromate K2Cr2O7 solution for complete reaction in the presence of dilute sulfuric acid. Calculate the percentage of iron(II) ions that had been oxidized by the air.
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