Table of contents

1. Intro to General Chemistry3h 48m
2. Atoms & Elements4h 16m
3. Chemical Reactions4h 10m
4. BONUS: Lab Techniques and Procedures1h 38m
5. BONUS: Mathematical Operations and Functions48m
6. Chemical Quantities & Aqueous Reactions3h 53m
7. Gases3h 49m
8. Thermochemistry2h 37m
9. Quantum Mechanics2h 58m
10. Periodic Properties of the Elements3h 9m
11. Bonding & Molecular Structure3h 29m
12. Molecular Shapes & Valence Bond Theory1h 57m
13. Liquids, Solids & Intermolecular Forces2h 23m
14. Solutions3h 1m
15. Chemical Kinetics2h 53m
16. Chemical Equilibrium2h 29m
17. Acid and Base Equilibrium5h 1m
18. Aqueous Equilibrium4h 47m
19. Chemical Thermodynamics1h 50m
20. Electrochemistry2h 42m
21. Nuclear Chemistry2h 36m
22. Organic Chemistry5h 7m
23. Chemistry of the Nonmetals2h 39m
24. Transition Metals and Coordination Compounds3h 16m

16. Chemical Equilibrium

Equilibrium Constant K

General Chemistry

16. Chemical Equilibrium

Equilibrium Constant K

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Multiple Choice

Which of the following is the correct equilibrium constant expression for the reaction: 3H+(aq) + PO4^3-(aq) ⇌ H3PO4(aq)?

K = [H+]^3[PO4^3-] / [H3PO4]

K = [H3PO4] / ([H+]^3[PO4^3-])

K = [H3PO4] / [H+][PO4^3-]

K = [H+]^3 / ([H3PO4][PO4^3-])

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Verified step by step guidance

Identify the general form of the equilibrium constant expression for a reaction: For a reaction aA + bB ⇌ cC + dD, the equilibrium constant expression is K = ([C]^c[D]^d) / ([A]^a[B]^b).

Apply the general form to the given reaction: 3H+(aq) + PO4^3-(aq) ⇌ H3PO4(aq). Here, the reactants are H+ and PO4^3-, and the product is H3PO4.

Write the equilibrium constant expression: The expression will be K = [H3PO4] / ([H+]^3[PO4^3-]), where [H3PO4] is the concentration of the product, and [H+]^3 and [PO4^3-] are the concentrations of the reactants raised to the power of their stoichiometric coefficients.

Compare the given options with the derived expression: The correct expression is K = [H3PO4] / ([H+]^3[PO4^3-]), which matches one of the provided options.

Understand why the other options are incorrect: The other options either do not correctly represent the stoichiometric coefficients or incorrectly place reactants/products in the numerator/denominator of the expression.