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 30, Problem 30.7QAP
Interpretation Introduction
Interpretation:
The principle of micellar electrokinetic capillary chromatography and its difference from capillary zone electrophoresis (CZE) needs to be explained.
Concept introduction:
Micellar electro kinetic capillary chromatography or MEKC is modified capillary electrophoresis wherein the samples are separated by partitioning the micelles and buffer solution. In this surfactant is added to buffer to get micelles. Micelle consists of conglomeration of 40 and above surfactant molecules in which the hydrocarbon tail which is positive points inward while the negative charged head point outwards.
The capillary zone electrophoresis involves buffer solution and sample loaded is placedin additional buffer solution. The capillary tube containing the sample is anode and solute migrates towards cathode at velocity.
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Calculating the pH at equivalence of a titration
A chemist titrates 210.0 mL of a 0.1003 M hydrobromic acid (HBr) solution with 0.7550M KOH solution at 25 °C. Calculate the pH at equivalence.
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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
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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
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AS is
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Chapter 30 Solutions
Principles of Instrumental Analysis, 6th Edition
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