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

Precipitation: Ksp vs Q

General Chemistry

18. Aqueous Equilibrium

Precipitation: Ksp vs Q

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Multiple Choice

Which of the following represents the molecular equation for the precipitation reaction that occurs when nickel (II) nitrate is mixed with barium sulfide?

No reaction occurs

Ni(NO3)2 + BaS → NiS + Ba(NO3)2

Ni(NO3)2 + BaS → Ba(NO3)2 + Ni(NO3)2

Ni(NO3)2 + BaS → Ni(NO3)2 + BaS

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Verified step by step guidance

Identify the reactants in the given problem: nickel (II) nitrate, which is Ni(NO3)2, and barium sulfide, which is BaS.

Determine the possible products of the reaction. In a precipitation reaction, ions in solution combine to form an insoluble solid. Here, Ni^2+ from Ni(NO3)2 can combine with S^2- from BaS to form nickel (II) sulfide, NiS, which is insoluble in water.

Write the balanced molecular equation for the reaction. The reactants are Ni(NO3)2 and BaS, and the products are NiS and Ba(NO3)2. The balanced equation is: Ni(NO3)2 + BaS → NiS + Ba(NO3)2.

Verify the solubility of the products. NiS is insoluble in water, which confirms that a precipitation reaction occurs. Ba(NO3)2 is soluble in water, remaining in solution.

Conclude that the correct molecular equation for the precipitation reaction is: Ni(NO3)2 + BaS → NiS + Ba(NO3)2, as it shows the formation of the insoluble precipitate NiS.