Principles of Instrumental Analysis, 6th Edition
6th Edition
ISBN: 9788131525579
Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher: Cenage 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
A 5.27-g sample of an ant-control preparation was decomposed by wet ashing with H₂SO4 and HNO3. The arsenic in
une residue was reduced to the trivalent state with hydrazine. After the excess reducing agent had been removed, the
arsenic(III) was oxidized with electrolytically generated 12 in a faintly alkaline medium:
HASO + 1₂ + 2HCO3 → HASO +21+ 2CO + H₂O
The titration was complete after a constant current of 105.2 mA had been passed for 10 min and 43 s. Express the
results of this analysis in terms of the percentage As2O3 in the original sample.
Explain why colour of KMnO4 disappears when oxalic acid is added to its solution in acidic medium.
Chapter 24 Solutions
Principles of Instrumental Analysis, 6th Edition
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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- Write a balanced net-ionic equations to describe a. reduction of Fe3+ to fe2+ by SO2b. reaction of H2MoO4 in a Jones reductorc. oxidation of HNO2 by a solution of MnO4-d. reaction of aniline (C6H4NH2) with a mixture of KBrO3 and KBr in acidic solutione. air oxidation of HAsO3(2-) to HAsO4(2-)f. reaction of KI with HNO2 in acidic solutionarrow_forward(b) Draw and explain the cyclic voltammo- gram of Fe (n-C5H5)2 in CH₂Cl2, where [NBu4] [PF6] is used as supporting electrolyte and Pt electrode as working electrode.arrow_forwardWrite balanced net-ionic equations to describe: (a) the reduction of Fe3+ to Fe2+ by SO2 (b) the reaction of H2MoO4 in a Jones reductor (c) the oxidation of HNO2 by a solution of MnO-4. (d) The reaction of aniline (C6H4NH2) with a mixture of KBrO3 and KBr in acidic solution (e) the air oxidation of HAsO2-3 to HasO2-4 (f) the reaction of KI with HNO2 in acidic solution Please answer letters d, e, and farrow_forward
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