Answered: The student then determined ΔH…

Chemistry: An Atoms First Approach

2nd Edition

ISBN:9781305079243

Author:Steven S. Zumdahl, Susan A. Zumdahl

Publisher:Steven S. Zumdahl, Susan A. Zumdahl

Chapter14: Acid- Base Equilibria

Section: Chapter Questions

Problem 79E

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The student then determined ΔH _{neutralization} for the reaction of sodium hydroxide and acetic acid, using the procedure described in this module. The student added 100.0 mL of 0.8500M NaOH to 100.0 mL of 0.8404M acetic acid. Prior to and following the mixing of the acid and base solutions, the following temperature-time data were collected.

g) Identify the limiting reagent and briefly explain why it is limiting.

h) Find ΔH _{neutralization} for the reaction.

Table 1
Common acid-base indicators and
their associated pH ranges
color change
lower higher
pH
indicator
pH range
pH
red to yellow
yellow to blue
red to yellow
red to yellow
Thymol Blue
1.2–2,8
8.0-9.6
Methyl Orange
Methyl Red
litmus
3.1-4.4
4.0-6.0
5.2-8.1
red to blue
Bromothymol Blue 6.0-7.6
phenolphthalein
yellow to blue
8.2–10.0 colorless to red
Alizarin Yellow R
10.1-12.0 yellow to red

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