UNT CHEM 1415 - Acids and Bases (2 pages)

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Acids and Bases



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Acids and Bases

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explanation of acids and bases and how they relate to chemical equilibrium using the pH equation. Free energy equation at chemical equilibrium.


Lecture number:
18
Pages:
2
Type:
Lecture Note
School:
University of North Texas
Course:
Chem 1415 - Gen Chem Engineers
Edition:
1

Unformatted text preview:

CHEM 1415 1st Edition Lecture 18 Unit Acids and Bases Outline of Current Lecture I Bronsted Lowry Definition II Conjugate acid base pairs III Example Problem 1 IV Free Energy and Chemical Equilibrium Current Lecture Bronsted Lowry definition an acid is a proton H donor and a base is a proton acceptor o water can act as both an acid or a base depending on the properties of the other substance o amphoteric refers to any substance that can be either an acid or a base Conjugate acid base pairs o Conjugate acid of a base is the acid formed when the base receives a proton o Conjugate base of an acid is the base formed when the acid gives a proton H o pH 3O log Example Problem 1 The K a of acetic acidC H 3 COOH is 1 8 10 5 what is the pH of a 0 10 M solution aq aq C H 3 CO O C H 3 COOH aq H 2 O l H3 O C H 3 COOH aq Initial concentration Change in Concentration Final aq H 3 O aq C H 3 CO O 0 10 0 0 x x x 0 10 x X X These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Concentration H 3 O C H 3 CO O K a 2 5 6 x 1 8 10 0 10 1 8 10 x 1 3 10 3 M pH log 1 3 10 3 2 9 Free Energy and Chemical Equilibrium o Equilibrium a state of minimum free energy o Free energy decreases as you move toward equilibrium from either direction o Chemical systems tend to move spontaneously toward equilibrium o G G RTlnQ



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