Principles of Instrumental Analysis
7th Edition
ISBN: 9781305577213
Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher: Cengage Learning
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Chapter 24, Problem 24.9QAP
Interpretation Introduction
Interpretation:
The percentage of
Concept introduction:
The Faraday’s law states that the quantity of electric change and mass of the substance is directly proportional to the amount of that substance liberated or deposited in the process of
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The digestion of a 0.1432 g sample of a compound containing phosphorous in a mixture of HNO3
and H2SO, resulted in the formation of CO2, H2O and H3PO4 Addition of ammonium molybdate
yielded a solid having the composition (NH)3PO, 12M0O3 (MW=1876.3 g/mol). This precipitate
was filtered washed, and dissolved in 50 00 mL of 0.2000 M NaOH:
(NH,)3PO4-12MO03(s)+ 26OH (aq)
HPO,2 (aq) +12M00,2 (aq) +14H2O(1) + 3NH3(g)
After the solution was boiled to remove NH3, the excess NaOH was titrated with 14.71mL of 0.1741
M HCI to a phenolphthalein end point (back titration). Calculate the percentage of phosphorous
in the solid sample.
6.19%
10.6%
O 27.6%
O0 238%
O 19.5
Explain why colour of KMnO4 disappears when oxalic acid is added to its solution in acidic medium.
Consider the reaction between dissolved Fe2+ and elemental sulfur (S0) to form hematite (Fe2O3) and sulfide a) Identify the oxidant and reductant in this reaction, determine half-reactions, and balance thereaction.
b) Is this reaction thermodynamically favorable?
c) Would you expect HS- to react readily with Fe2O3 (i.e. the reverse of the reaction)?
Chapter 24 Solutions
Principles of Instrumental Analysis
Ch. 24 - Prob. 24.1QAPCh. 24 - Calculate the minimum difference in standard...Ch. 24 - Prob. 24.3QAPCh. 24 - Halide ions can he deposited at a silver anode,...Ch. 24 - What cathode potential (versus SCE) would be...Ch. 24 - Calculate the Lime required for a constant current...Ch. 24 - Calculate the time required for a constant current...Ch. 24 - Prob. 24.8QAPCh. 24 - Prob. 24.9QAPCh. 24 - A 0.0712-g sample of a purified organic acid was...
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