Chemical equilibrium The equilibrium constant K
Friday, February 22, 2019

Chemical equilibrium The equilibrium constant K

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Chemistry

Chemical equilibrium

Equilibrium constant

Learn

Reactions in equilibrium

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Keq intuition

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The equilibrium constant K

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Keq derivation intuition

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Heterogeneous equilibrium

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Calculating equilibrium constant Kp using partial pressures

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Small x approximation for small Kc

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Small x approximation for large Kc

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Practice

Writing equilibrium constant expressions
7 questions

Factors that affect chemical equilibrium

Learn

Le Chatelier's principle

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Le Chatelier's principle: Worked example

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Introduction to reaction quotient Qc

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The reaction quotient Q

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Comparing Q vs K example

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Practice

Using Le Chatelier's principle
4 questions

About this unit

Many chemical reactions are reversible, and the forward and backward reactions can occur at the same time. When the rate of the forward reaction is equal to the rate of the backward reaction, we call that a dynamic equilibrium. We will learn how equilibrium can be described by the equilibrium constant K, and how different factors than can affect the chemical equilibrium.


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Keq intuition | Chemical equilibrium | Chemistry | Khan Academy 

Keq intuition | Chemical equilibrium | Chemistry | Khan Academy

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Date Added: August 14, 2016


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Lecture Description

A probabilistic look at how molecules react to develop the intuition behind the equilibrium constant formula. Not necessary to keep progressing through chemistry. Created by Sal Khan.

Watch the next lesson: www.khanacademy.org/science/chemistry/chemical-equilibrium/equilibrium-constant/v/keq-derivation-intuition-can-skip-bit-mathy?utm_source=YT&utm_medium=Desc&utm_campaign=chemistry

Missed the previous lesson? www.khanacademy.org/science/chemistry/chemical-equilibrium/equilibrium-constant/v/reactions-in-equilibrium?utm_source=YT&utm_medium=Desc&utm_campaign=chemistry

Chemistry on Khan Academy: Did you know that everything is made out of chemicals? Chemistry is the study of matter: its composition, properties, and reactivity. This material roughly covers a first-year high school or college course, and a good understanding of algebra is helpful.

Course Index

  1. Introduction to chemistry
  2. Elements and atoms | Atoms, compounds, and ions | Chemistry | Khan Academy
  3. Introduction to the atom | Chemistry of life | Biology | Khan Academy
  4. Orbitals | Electronic structure of atoms | Chemistry | Khan Academy
  5. More on orbitals and electron configuration | Chemistry | Khan Academy
  6. Electron Configurations
  7. Electron configurations 2 | Electronic structure of atoms | Chemistry | Khan Academy
  8. Noble gas configuration (old, low volume)
  9. Noble gas configuration | Electronic structure of atoms | Chemistry | Khan Academy
  10. Valence Electrons
  11. Groups of the Periodic Table
  12. Periodic Table Trends: Ionization Energy
  13. Other Periodic Table Trends
  14. Ionic, covalent, and metallic bonds | Chemical bonds | Chemistry | Khan Academy
  15. Molecular and Empirical Formulas
  16. The mole and Avogadro’s number | Atoms, compounds, and ions | Chemistry | Khan Academy
  17. Formula from Mass Composition
  18. Another mass composition problem | Chemistry | Khan Academy
  19. Balancing Chemical Equations
  20. Stoichiometry | Chemical reactions and stoichiometry | Chemistry | Khan Academy
  21. Stoichiometry: Limiting reagent | Chemical reactions and stoichiometry | Chemistry | Khan Academy
  22. Ideal gas equation: PV = nRT | Chemistry | Khan Academy
  23. Ideal gas equation example 1 | Chemistry | Khan Academy
  24. Ideal gas equation example 2 | Chemistry | Khan Academy
  25. Ideal gas equation example 3 | Chemistry | Khan Academy
  26. Ideal gas equation example 4 | Chemistry | Khan Academy
  27. Introduction to partial pressure | Gases and kinetic molecular theory | Chemistry | Khan Academy
  28. Partial pressure example | Chemistry | Khan Academy
  29. States of matter | States of matter and intermolecular forces | Chemistry | Khan Academy
  30. States of matter follow-up | States of matter and intermolecular forces | Chemistry | Khan Academy
  31. Specific heat, heat of fusion and vaporization example | Chemistry | Khan Academy
  32. Chilling water problem | States of matter and intermolecular forces | Chemistry | Khan Academy
  33. Phase diagrams | States of matter and intermolecular forces | Chemistry | Khan Academy
  34. Van der Waals forces | States of matter and intermolecular forces | Chemistry | Khan Academy
  35. Covalent networks, metallic crystals, and ionic crystals | Chemistry | Khan Academy
  36. Vapor pressure | States of matter and intermolecular forces | Chemistry | Khan Academy
  37. Suspensions, colloids and solutions | Chemistry | Khan Academy
  38. Solubility and intermolecular forces | Chemistry | Khan Academy
  39. Boiling point elevation and freezing point depression | Chemistry | Khan Academy
  40. Introduction to kinetics | Energy and enzymes | Biology | Khan Academy
  41. Reactions in equilibrium | Chemical equilibrium | Chemistry | Khan Academy
  42. Group trend for ionization energy | Periodic table | Chemistry | Khan Academy
  43. Keq intuition | Chemical equilibrium | Chemistry | Khan Academy
  44. Keq derivation intuition | Chemical equilibrium | Chemistry | Khan Academy
  45. Heterogeneous equilibrium | Chemical equilibrium | Chemistry | Khan Academy
  46. Le Chatelier’s principle | Chemical equilibrium | Chemistry | Khan Academy
  47. Introduction to pH, pOH, and pKw
  48. Acid Base Introduction
  49. pH, pOH of strong acids and bases | Chemistry | Khan Academy
  50. pH of a Weak Acid
  51. pH of a Weak Base
  52. Conjugate acids and bases
  53. pKa and pKb relationship | Acids and bases | Chemistry | Khan Academy
  54. Buffers and Henderson-Hasselbalch | Chemistry | Khan Academy
  55. Strong Acid Titration
  56. Buffer capacity | Buffers, titrations, and solubility equilibria | Chemistry | Khan Academy
  57. Weak Acid Titration
  58. Private video
  59. Titration roundup | Buffers, titrations, and solubility equilibria | Chemistry | Khan Academy
  60. Introduction to Oxidation States
  61. More on Oxidation States
  62. Hydrogen Peroxide Correction
  63. Redox Reactions
  64. Galvanic Cells
  65. Types of decay | Nuclear chemistry | Chemistry | Khan Academy
  66. Half-life and carbon dating | Nuclear chemistry | Chemistry | Khan Academy
  67. Exponential decay formula proof (can skip, involves calculus) | Chemistry | Khan Academy
  68. Introduction to exponential decay | Nuclear chemistry | Chemistry | Khan Academy
  69. More exponential decay examples | Nuclear chemistry | Chemistry | Khan Academy
  70. Macrostates and microstates | Thermodynamics | Physics | Khan Academy
  71. Quasistatic and reversible processes | Thermodynamics | Physics | Khan Academy
  72. First law of thermodynamics / internal energy | Thermodynamics | Physics | Khan Academy
  73. More on internal energy | Thermodynamics | Physics | Khan Academy
  74. Work from expansion | Thermodynamics | Physics | Khan Academy
  75. PV-diagrams and expansion work | Thermodynamics | Physics | Khan Academy
  76. Proof: U = (3/2)PV or U = (3/2)nRT | Thermodynamics | Physics | Khan Academy
  77. Work done by isothermic process | Thermodynamics | Physics | Khan Academy
  78. Carnot cycle and Carnot engine | Thermodynamics | Physics | Khan Academy
  79. Proof: Volume ratios in a carnot cycle | Thermodynamics | Physics | Khan Academy
  80. Proof: S (or entropy) is a valid state variable | Thermodynamics | Physics | Khan Academy
  81. Thermodynamic entropy definition clarification | Physics | Khan Academy
  82. Reconciling thermodynamic and state definitions of entropy | Physics | Khan Academy
  83. Entropy intuition | Thermodynamics | Physics | Khan Academy
  84. Maxwell’s demon | Thermodynamics | Physics | Khan Academy
  85. More on entropy | Thermodynamics | Physics | Khan Academy
  86. Efficiency of a Carnot engine | Thermodynamics | Physics | Khan Academy
  87. Carnot efficiency 2: Reversing the cycle | Thermodynamics | Physics | Khan Academy
  88. Carnot efficiency 3: Proving that it is the most efficient | Physics | Khan Academy
  89. Enthalpy | Thermodynamics | Chemistry | Khan Academy
  90. Heat of formation | Thermodynamics | Chemistry | Khan Academy
  91. Hess’s law and reaction enthalpy change | Chemistry | Khan Academy
  92. Gibbs free energy and spontaneity | Chemistry | Khan Academy
  93. Gibbs free energy example | Thermodynamics | Chemistry | Khan Academy
  94. More rigorous Gibbs free energy / spontaneity relationship | Chemistry | Khan Academy
  95. A look at a seductive but wrong Gibbs/spontaneity proof | Chemistry | Khan Academy
  96. Stoichiometry example problem 1 | Chemistry | Khan Academy
  97. Stoichiometry example problem 2 | Chemistry | Khan Academy
  98. Limiting reactant example problem 1 | Chemistry | Khan Academy
  99. Empirical and Molecular Formulas from Stoichiometry
  100. Example of Finding Reactant Empirical Formula
  101. Stoichiometry of a Reaction in Solution
  102. Another Stoichiometry Example in a Solution
  103. Molecular and Empirical Forumlas from Percent Composition
  104. Acid base titration example | Chemistry | Khan Academy
  105. Spectrophotometry introduction | Kinetics | Chemistry | Khan Academy
  106. Spectrophotometry example | Kinetics | Chemistry | Khan Academy
  107. Hess’s law example | Thermodynamics | Chemistry | Khan Academy
  108. Vapor pressure example | Chemistry | Khan Academy
  109. Change of state example | States of matter and intermolecular forces | Chemistry | Khan Academy
  110. Small x approximation for small Kc | Chemistry | Khan Academy
  111. Small x approximation for large Kc | Chemical equilibrium | Chemistry | Khan Academy
  112. pH and pKa relationship for buffers | Chemistry | Khan Academy
  113. 2015 AP chemistry free response 5a
  114. AP Chemistry multiple choice sample: Boiling points
  115. Rate constant k from half-life example | Knetics | Chemistry | Khan Academy
  116. Ways to get a buffer solution | Chemistry | Khan Academy
  117. Comparing Q vs K example | Chemical equilibrium | Chemistry | Khan Academy
  118. Finding units of rate constant k | Knetics | Chemistry | Khan Academy
  119. Calculating internal energy and work example | Chemistry | Khan Academy
  120. Ionic bonds and Coulombs law
  121. Bond enthalpy and enthalpy of reaction | Chemistry | Khan Academy
  122. Introduction to reaction quotient Qc | Chemical equilibrium | Chemistry | Khan Academy
  123. Le Chatelier’s principle: Worked example | Chemical equilibrium | Chemistry | Khan Academy
  124. Conjugate acid-base pairs | Acids and bases | Chemistry | Khan Academy

Course Description

An introductory college-level chemistry course that explores topics such as atoms, compounds, and ions; chemical reactions and stoichiometry; ideal gases; chemical equilibrium; acids and bases; kinetics; thermodynamics; redox reactions and electrochemistry; and a whole lot more!

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