Chapter 16 Acid Base

Chapter 16 Acid Base - Review Problem: Chapter 15 Review...

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Unformatted text preview: Review Problem: Chapter 15 Review Problem: Chapter 15 • For the equilibrium PCl 5 (g) PCl 3 (g) + Cl 2 (g), the equilibrium constant K eq has the value 0.497 at 500 K. A gas cylinder at 500 K is charged with PCl 5 (g) at an initial pressure of 1.66 atm. What are the equilibrium pressures of PCl 5 , PCl 3 , and Cl 2 at this temperature? • Answers are 0.97, 0.693, and 0.693, respectively. Chapter 16 Chapter 16 Acid-Base Equilibria Acid-Base Equilibria CHEMISTRY The Central Science 9th Edition What Should You Understand? What Should You Understand? • Acids and bases: • What are they (example)?. • What are their physical and chemical properties? • How do they affect the rate of a reaction? • How can they be quantified (i.e., expression of the concentration of an acid or base in a solution? • Acids and Bases: • Important in biological, industrial, reactions in the laboratory, etc. • Acids taste sour and cause dyes to change color. • Bases taste bitter and feel soapy . • Arrhenius concept of acids and bases: Acids and Bases: A Brief Acids and Bases: A Brief Review Review • A more general definition for acids and bases, based on the bronsted-Lowry concept, is that acid-base reactions involve proton transfer. Br Br ønsted-Lowry Acids and ønsted-Lowry Acids and Bases Bases +- Proton Transfer Proton Transfer • Whatever is left of the acid after the proton is donated is called its conjugate base . • Similarly, whatever remains of the base after it accepts a proton is called a conjugate acid . • Consider Conjugated Conjugated Acids and Acids and Bases Bases HA( aq ) + H 2 O( l ) H 3 O + ( aq ) + A- ( aq ) Class Practice Problem Class Practice Problem • What is the conjugated base of each of the following - 4-2 2 3- • The stronger the acid, the weaker the conjugate base; the stronger the base, the weaker the conjugated acid.- Strengths of Strengths of Acids and Acids and Bases Bases Acids and Acids and Bases Bases Predicting Direction of Predicting Direction of Equilibrium Equilibrium • Acid-base strengths allow us to predict in which direction equilibrium will lie (i.e., to the left or right) • Example problem: • Predict whether the equilibrium lies to the left or right for the reaction in sample exercise 16.3 using the previous table. •...
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This note was uploaded on 02/20/2011 for the course CHEM 101 taught by Professor John during the Spring '11 term at Caldwell College.

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Chapter 16 Acid Base - Review Problem: Chapter 15 Review...

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