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

6. Chemical Quantities & Aqueous Reactions

Solubility Rules

General Chemistry

6. Chemical Quantities & Aqueous Reactions

Solubility Rules

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Multiple Choice

Which of the following is the correct solubility product (K_sp) expression for Mg3(PO4)2(s) dissolving in water?

K_sp = [Mg^{2+}] [PO_4^{3-}]

K_sp = [Mg^{2+}]^3 [PO_4^{3-}]^2

K_sp = [Mg^{2+}]^2 [PO_4^{3-}]^3

K_sp = [Mg^{3+}]^2 [PO_4^{2-}]^3

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Verified step by step guidance

Identify the dissociation equation of the solid salt Mg3(PO4)2 in water. Write it as: $\mathrm{Mg_3(PO_4)_2 (s) \rightleftharpoons 3 Mg^{2+} (aq) + 2 PO_4^{3-} (aq)}$.

Recall that the solubility product constant, $K_{sp}$, is the equilibrium constant for the dissolution of a sparingly soluble salt, expressed in terms of the molar concentrations of the ions produced, each raised to the power of their stoichiometric coefficients.

Write the general form of the $K_{sp}$ expression for this salt: $K_{sp} = [Mg^{2+}]^{3} [PO_4^{3-}]^{2}$, where the exponents correspond to the number of ions produced from one formula unit of the salt.

Check the charges and stoichiometric coefficients carefully to ensure the ions and their powers match the dissociation equation; magnesium ion is $Mg^{2+}$ and phosphate ion is $PO_4^{3-}$, with coefficients 3 and 2 respectively.

Conclude that the correct $K_{sp}$ expression is $K_{sp} = [Mg^{2+}]^{3} [PO_4^{3-}]^{2}$, matching the stoichiometry of the dissociation.