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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Question
Chapter 24, Problem 24.11QAP
Interpretation Introduction
Interpretation:
The mass of
Concept introduction:
The sum of the total mass of a molecule in grams which is made by a particular molecule is called molar mass of a molecule.
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Traces of aniline can be determined by reaction with an excess of electrolytically generated Br2:
C6H5NH2 + 3Br2 =====è C6H2Br3NH2 + 3H+ + 3Br-
The polarity of the working electrode is then reversed, and the excess bromine is determined by a coulometric titration involving the generation of Cu(I):
Br2 + 2Cu+ ===è 2Br- + 2Cu2+
Suitbale quantities of KBr and copper (II) sulfate were added to a 25.0 ml sample containing aniline (C6H5NH2). Calculate the mass in micrograms of C6H5NH2 in the sample from the accompanying data.
Working electrode Functioning as
Generation Time (min) with a constant current of 1.00 mA
Anode
3.76
cathode
0.270
At 25ºC, you conduct a titration of 20.00 mL of a 0.0400 M AgNo3 solution with a 0.050 M NaI soution within the following cell:
saturated calomel electrode | Titration solution | Ag (s)
For the cell as written, what is the voltage after the addition of 40.00 mL of NaI solution? The reduction potential for the saturated calomel electrode is E= 0.241 V. The standard reduction potential for the reaction: Ag++e- ® Ag (s)
E0= 0.79993 V. The solubility constant of AgI is Ksp=8.3x10^-17
Note: the cell potential could be negative since the conditions are non-standard ones.
a) -0.146
b) -0.292
c) 0.146
d) 0.360
e) 0.180
acid dissociation constants for H3PO4 (Ka1 = 7.11 × 10-3, Ka2 = 6.32 × 10-8, Ka3 = 7.1× 10-14), calculate standard reduction potential for the half reactionH2PO4- + H+ + 2e HPO32- + H2O
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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