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

18. Aqueous Equilibrium

Solubility Product Constant: Ksp

General Chemistry

18. Aqueous Equilibrium

Solubility Product Constant: Ksp

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Multiple Choice

Ca3(PO4)2 is being dissolved in water. If only 0.46 g of Ca3(PO4)2 will dissolve in 100 mL of water at 25°C, what is the solubility product, Ksp, of this salt at this temperature?

2.0 x 10^-20

3.5 x 10^-18

5.0 x 10^-15

1.0 x 10^-25

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Verified step by step guidance

First, write the balanced dissolution equation for calcium phosphate: Ca3(PO4)2(s) ⇌ 3Ca^2+(aq) + 2PO4^3-(aq).

Calculate the molar mass of Ca3(PO4)2 by adding the atomic masses of all atoms in the formula: Ca (40.08 g/mol), P (30.97 g/mol), and O (16.00 g/mol).

Determine the number of moles of Ca3(PO4)2 that dissolve in 100 mL of water by dividing the mass of the dissolved salt (0.46 g) by its molar mass.

Use the stoichiometry of the dissolution reaction to find the concentrations of Ca^2+ and PO4^3- ions in the solution. For every mole of Ca3(PO4)2 that dissolves, 3 moles of Ca^2+ and 2 moles of PO4^3- are produced.

Calculate the solubility product, Ksp, using the expression Ksp = [Ca^2+]^3[PO4^3-]^2, substituting the concentrations of the ions obtained from the previous step.