Chemistry The Molecular Nature Of Matter And Change 9th
9th Edition
ISBN: 9781260240214
Author: SILBERBERG
Publisher: McGraw Hill
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Chapter 16, Problem 16.104P
(a)
Interpretation Introduction
Interpretation: An Experimental method for measuring the change in concentration with time for given reaction has to be suggested.
Concept introduction:
Conductometric method: The change in electrical conductivity of the reaction solution when nonionic reactants form ionic products.
(b)
Interpretation Introduction
Interpretation: An Experimental method for measuring the change in concentration with time for given reaction has to be suggested.
Concept introduction:
Manometric methods: A manometer attached to a reaction vessel of fixed volume and temperature. The manometer measures the pressure change in the vessel due to a reaction that involves a change in the number of moles of gas.
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Br
HO
?
HO
✓
OH
Use the literature Ka value of the acetic acid, and the data below to answer these questions. Note: You will not use the experimental titration graphs to answer the questions that follow.
Group #1:
Buffer pH = 4.35
Group #2:
Buffer pH = 4.70
Group #3:
Buffer pH = 5.00
Group #4:
Buffer pH = 5.30
Use the Henderson-Hasselbalch equation, the buffer pH provided and the literature pKa value of acetic acid to perform the following:
a) calculate the ratios of [acetate]/[acetic acid] for each of the 4 groups buffer solutions above.
b) using the calculated ratios, which group solution will provide the best optimal buffer (Hint: what [acetate]/[acetic acid] ratio value is expected for an optimal buffer?)
c) explain your choice
How would you prepare 1 liter of a 50 mM Phosphate buffer at pH 7.5 beginning with K3PO4 and 1 M HCl or 1 M NaOH? Please help and show calculations. Thank you
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