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 correctly describes the dissolution of potassium sulfide (K2S) in water?

K2S is insoluble in water because sulfide salts are generally insoluble.

K2S is soluble in water because all potassium salts are soluble.

K2S partially dissolves in water, forming a precipitate.

K2S reacts with water to form potassium hydroxide and hydrogen sulfide gas.

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Verified step by step guidance

Step 1: Understand the solubility rules for ionic compounds in water. Generally, all potassium (K⁺) salts are soluble in water regardless of the anion they are paired with.

Step 2: Recognize that potassium sulfide (K₂S) is an ionic compound composed of potassium ions (K⁺) and sulfide ions (S²⁻). Since potassium salts are soluble, K₂S should dissolve in water.

Step 3: Consider the behavior of the sulfide ion (S²⁻) in water. Sulfide ions can react with water to some extent, producing hydroxide ions (OH⁻) and hydrogen sulfide (H₂S) gas, but this is a secondary reaction and does not prevent the initial dissolution.

Step 4: Evaluate the options given: the statement that K₂S is insoluble is incorrect based on solubility rules; partial dissolution with precipitate formation is unlikely; and while K₂S can react with water, the primary description of dissolution focuses on solubility.

Step 5: Conclude that the best description is that K₂S is soluble in water because all potassium salts are soluble, which aligns with standard solubility rules.