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Study Guide for Test 3 Chem 1036

by: Kaitlyn Michaud

Study Guide for Test 3 Chem 1036 Chemistry 1046

Kaitlyn Michaud
Virginia Tech

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About this Document

This study guide has practice problems on calculating buffer pH, titrations, entropy, enthalpy, and Gibb's Free energy. It also has non-mathematical questions to check for understanding of concept.
General Chemistry
Dr. Neidigh
Study Guide
Chemistry, chem 1036, Virginia Tech, pH, buffers, titrations, gibb's free energy, entropy, Enthalpy, spontaneous reactions
50 ?




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This 8 page Study Guide was uploaded by Kaitlyn Michaud on Friday April 1, 2016. The Study Guide belongs to Chemistry 1046 at Virginia Polytechnic Institute and State University taught by Dr. Neidigh in Spring 2016. Since its upload, it has received 103 views. For similar materials see General Chemistry in Chemistry at Virginia Polytechnic Institute and State University.

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Date Created: 04/01/16
TEST 3 STUDY GUIDE CHEM 1046 This test covers acid base buffers and how to calculate them, titrations, and thermodynamics including entropy, enthalpy, and Gibb’s Free energy. 1. When does pK < pHa pH=pK , and pK apH a 2. What is the Henderson Hasselbach equation? 3. Calculate the buffer of pH of .21 M NaC H O , 2nd3.27 HC H O 2 3 2 -5 acid. (K a1.8 X 10 ) 4. Calculate the pH used in the previous problem after adding .035 mol HNO to31 L of the buffer. 5. When does the equivalence point of a titration = 7? Under what conditions would it be <7 and >7 ? 6. How do entropy and enthalpy determine spontaneity of a reaction? 7. (below) 8. Which of the following is always true? 9. (below) 10. (below) 11. (below) Solutions: 1. pKa< pH when there is a higher concentration of acid. pKa=pH when the concentrations of acid=base, and pKa>pH when more base is present. 2. pH=pKa+log[base]/[acid]  see if you can understand the link between this equation and the answer to #1. 3. 4.65 4. 4.48 5. The equivalence point of a titration will =7 when you are titrating a strong acid and strong base. The equivalence point will be less than 7 when titrating a weak base with a strong acid, and it will be greater than 7 when titrating a weak acid with a strong base. *If you don’t understand why check out my notes on 19.1-19.2 6. Remember Gibb’s Free Energy! ΔH is enthalpy and ΔS is entropy 7. -206 kJ 8. Answer 2 9. Answer 4 10. Answer 3 11. Answer 3


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