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CHM135H1 Study Guide - Midterm Guide: Phenolphthalein, Dynamic Equilibrium, Reaction QuotientPremium


Department
Chemistry
Course Code
CHM135H1
Professor
Kris Quinlan
Study Guide
Midterm

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University of Toronto
St. George
CHM135H1
Chemistry: Physical Properties
Fall 2017
Term Test 2
Prof: Kris Quinlan
Exam Guide
Part 2 of 2

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Table of Contents:
Part 2
Reaction Direction and Dissociation
Salts in Solution I
Salts in Solution II
Buffers
Thermochemistry
Enthalpy, Heat Capacity, and Calorimetry
Using and Calculating Enthalpies
Entropy
Entropy and Free Energy
Gibbs Free Energy

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Reaction Direction and Dissociation
Reaction Direction
Does the equilibrium lie to the reactant or product side?
Reactions always go from the stronger acid and base to the weaker acid and base
Predicting the Net Direction of an Acid-Base Reaction
We identify the conjugate acid-base pairs and consult the table to see which acid and
base are stronger
The reaction favours the formation of the weaker acid and base
o     
The net direction for this reaction is to the right, so  
o     
The net direction for this reaction is to the left, so  
Dissociation of Water
Water acts as both an acid and a base
  
For any aqueous solution, the ion-product constant for water is:
o    
A change in concentration of hydronium ions [H3O+] causes an inverse change in
concentration of hydroxide ions [OH]
oHigher [H3O+] = lower [OH]
oHigher [OH] = lower [H3O+]
We can define the terms ‘acidic’ and ‘basic’ in terms of the relative concentrations of
H3O+ and OH ions:
oIn an acidic solution, 
oIn a neutral solution, 
oIn a basic solution 
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