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What is the absolute error on the calculated milligrams of iron in this sample? a. ± 10 mg b. ±3 mg c. 17 mg d. +0.7 mg e. +4 mg

What is the absolute error on the calculated milligrams of iron in this sample? a. ± 10 mg b. ±3 mg c. 17 mg d. +0.7 mg e. +4 mg

Chemistry: Principles and Reactions
Chemistry: Principles and Reactions
8th Edition
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:William L. Masterton, Cecile N. Hurley
Chapter4: Reactions In Aqueous Solution
Section: Chapter Questions
Problem 53QAP: The molarity of iodine in solution can be determined by titration with arsenious acid, H3AsO4. The...
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3. A student uses a class B burette (the error on this burette is + 0.1 mL) to complete a redox titration with potassium permanganate added to a sample containing aqueous iron (the balanced reaction is below). An Erlenmeyer flask contains the iron solution and the titrant is an aqueous solution of 0.125 M KMNO4. The initial volume of KMNO4 in the burette is recorded as "five milliliters" with a final volume recorded as "twelve milliliters." This is the volume it took to completely react all of the iron in the sample. 5 Fe?* (aq) + MnO4" (aq) + 8 H* (aq) → Mn²* (aq) + 5 Fe* (aq) + 4 H2O (1) What is the absolute error on the calculated milligrams of iron in this sample? a. ± 10 mg b. ±3 mg c. 17 mg d. +0.7 mg e. +4 mg
Transcribed Image Text:3. A student uses a class B burette (the error on this burette is + 0.1 mL) to complete a redox titration with potassium permanganate added to a sample containing aqueous iron (the balanced reaction is below). An Erlenmeyer flask contains the iron solution and the titrant is an aqueous solution of 0.125 M KMNO4. The initial volume of KMNO4 in the burette is recorded as "five milliliters" with a final volume recorded as "twelve milliliters." This is the volume it took to completely react all of the iron in the sample. 5 Fe?* (aq) + MnO4" (aq) + 8 H* (aq) → Mn²* (aq) + 5 Fe* (aq) + 4 H2O (1) What is the absolute error on the calculated milligrams of iron in this sample? a. ± 10 mg b. ±3 mg c. 17 mg d. +0.7 mg e. +4 mg
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