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 24.11QAP
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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Using the conditions of spontaneity to deduce the signs of AH and AS
Use the observations about each chemical reaction in the table below to decide the sign (positive or negative) of the reaction enthalpy AH and reaction entropy
AS.
Note: if you have not been given enough information to decide a sign, select the "unknown" option.
reaction
observations
conclusions
A
This reaction is always spontaneous, but
proceeds slower at temperatures above
120. °C.
ΔΗ is
(pick one)
AS is
(pick one)
ΔΗ is
(pick one)
B
This reaction is spontaneous except above
117. °C.
AS is
(pick one)
ΔΗ is
(pick one)
This reaction is slower below 20. °C than
C
above.
AS is
|(pick one)
?
18
Ar
1
Calculating the pH at equivalence of a titration
Try Again
Your answer is incorrect.
0/5
a
A chemist titrates 70.0 mL of a 0.7089 M hydrocyanic acid (HCN) solution with 0.4574M KOH solution at 25 °C. Calculate the pH at equivalence. The pK of
hydrocyanic acid is 9.21.
Round your answer to 2 decimal places.
Note for advanced students: you may assume the total volume of the solution equals the initial volume plus the volume of KOH solution added.
pH
=
11.43]
G
00.
18
Ar
B•
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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