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Chemistry: The Central Science | 14th Edition | ISBN: 9780134414232 | Authors: Theodore E. Brown; H. Eugene LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward; Matthew E. Stoltzfus ISBN: 9780134414232 1274

Solution for problem 5.3 Chapter 5

Chemistry: The Central Science | 14th Edition

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Chemistry: The Central Science | 14th Edition | ISBN: 9780134414232 | Authors: Theodore E. Brown; H. Eugene LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward; Matthew E. Stoltzfus

Chemistry: The Central Science | 14th Edition

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Problem 5.3

Consider the accompanying energy diagram.

(a) Does this diagram represent an increase or decrease in the internal energy of the system?

(b) What sign is given to \(\Delta E\) for this process?

(c) If there is no work associated with the process, is it exothermic or endothermic? [Section 5.2]

Text Transcription:

\Delta E

Step-by-Step Solution:
Step 1 of 3

Week 10 Notes Buffers ● Buffer = when a weak acid and its conjugate weak base are both present ● Buffer region = beginning of titration up until pH spikes ● Henderson-Hasselbalch: super useful equation ○ pH = -log(pKa) + log[Base]/[Acid] ■ Any units can be used for acid and base, like M, grams, etc. ● ½ equivalence point: pH = pKa Titrations ● Types of Titrations ○ Strong acid strong base: pH = 7 at equivalence point ○ Strong acid weak base: pH < 7 at equivalence point ○ Weak acid strong base: pH > 7 at equivalence point ● Indicators ○ pKa of acid should be in the region where indicator changes color ○ Indicator should change color during the spike in pH on graph/ around the equivalence point ● At equivalence point/ end point of the titration, [H+] = [OH-] Solubility ● The lower the Ksp value, the sooner the substance will precipitate out of solution -17​ -12 ○ ex) AgI: Ksp = 2.6 x 10​ , PbI​ :2​sp = 3.8 x 10​ ■ AgI will precipitate first ● If Q < Ksp, reaction will proceed spontaneously ● Concentration of the original solid does NOT affect solubility, but a common ion already in solution - ​ ○ ex) take AgI (s) . If there are already I​ ions in solution, this will decrease the solubility because the reaction will shift to t

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Chapter 5, Problem 5.3 is Solved
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Textbook: Chemistry: The Central Science
Edition: 14
Author: Theodore E. Brown; H. Eugene LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward; Matthew E. Stoltzfus
ISBN: 9780134414232

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