Iruma-kun wants to determine if the Demon Destroyer Lake had been contaminated by Fe2• from surrounding factories. He employed a redox titration between Fe2* and permanganate. He filled a container with 150.00ml water sample. He then added a certair volume of HCl and performed additional steps to remove interferences. Afterwards, he took 15.00 ml aliquot, placed it in a 100.0 ml volumetric flask and diluted it with deionized water. A 15.00 ml aliquot was taken and titrated with 2.15 ml of KMN04. The products of the reaction are shown below. Fe2+ + MnO4- → Mn²+ + Fe3• Prior to the analysis, the KMnO4 solution was first standardized against ferrous ammonium sulfate hexahydrate (FAS, FeH20N2O14S2) (392.1 g/mol, 99.40% purity). To do so, he dissolved different masses of FAS in water, and diluted to 50.0 mL. He then took 25.00 mL aliquot and added approximately 15 mL of distilled water. This final solution was titrated, and its data are found below. Table 3. Standardization of KMn04 Weigh of FAS, g 0.60808 Volume, mL 5.235 Trial 1 5.265 2 3 0.60816 0.60822 5.274
Iruma-kun wants to determine if the Demon Destroyer Lake had been contaminated by Fe2• from surrounding factories. He employed a redox titration between Fe2* and permanganate. He filled a container with 150.00ml water sample. He then added a certair volume of HCl and performed additional steps to remove interferences. Afterwards, he took 15.00 ml aliquot, placed it in a 100.0 ml volumetric flask and diluted it with deionized water. A 15.00 ml aliquot was taken and titrated with 2.15 ml of KMN04. The products of the reaction are shown below. Fe2+ + MnO4- → Mn²+ + Fe3• Prior to the analysis, the KMnO4 solution was first standardized against ferrous ammonium sulfate hexahydrate (FAS, FeH20N2O14S2) (392.1 g/mol, 99.40% purity). To do so, he dissolved different masses of FAS in water, and diluted to 50.0 mL. He then took 25.00 mL aliquot and added approximately 15 mL of distilled water. This final solution was titrated, and its data are found below. Table 3. Standardization of KMn04 Weigh of FAS, g 0.60808 Volume, mL 5.235 Trial 1 5.265 2 3 0.60816 0.60822 5.274
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. Calculate the molarity of KMnO4 standard solution for each trial?
b. What is the average molarity of the KMnO4 titrant?
c. Calculate the amount of Fe2+ in the 150.00 ml sample in terms of ppm Fe.
d. If the allowable Fe content for lakes is 4,153 mg/L, is it considered safe?
Transcribed Image Text:Iruma-kun wants to determine if the Demon Destroyer Lake had been contaminated by
Fe2* from surrounding factories. He employed a redox titration between Fe2• and
permanganate. He filled a container with 150.00ml water sample. He then added a certain
volume of HCl and performed additional steps to remove interferences. Afterwards, he
took 15.00 ml aliquot, placed it in a 100.0 ml volumetric flask and diluted it with
deionized water. A 15.00 ml aliquot was taken and titrated with 2.15 ml of KMN04. The
products of the reaction are shown below.
Fe2+ + Mn04- → Mn²+ + Fe3+
Prior to the analysis, the KMNO4 solution was first standardized against ferrous
ammonium sulfate hexahydrate (FAS, FEH20N2O14S2) (392.1 g/mol, 99.40% purity). To do
so, he dissolved different masses of FAS in water, and diluted to 50.0 mL. He then took
25.00 mL aliquot and added approximately 15 mL of distilled water. This final solution
was titrated, and its data are found below.
Table 3. Standardization of KMN04
Weigh of FAS, g
Trial
Volume, mL
1
0.60808
5.235
2
0.60816
5.265
3
0.60822
5.274
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