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 one of the following combinations would NOT form a precipitate in aqueous solution?

BaCl_2 and Na_2SO_4

AgNO_3 and NaCl

Pb(NO_3)_2 and KI

NaNO_3 and KCl

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Verified step by step guidance

Identify the ions present in each combination by dissociating the compounds into their constituent ions. For example, BaCl_2 dissociates into Ba^{2+} and 2Cl^{-}, and Na_2SO_4 dissociates into 2Na^{+} and SO_4^{2-}.

Use the solubility rules to determine if any of the possible combinations of cations and anions will form an insoluble compound (precipitate). Key rules include: most sulfates (SO_4^{2-}) are soluble except those with Ba^{2+}, Pb^{2+}, and a few others; most chlorides (Cl^{-}) are soluble except those with Ag^{+}, Pb^{2+}, and Hg_2^{2+}; most nitrates (NO_3^{-}) and alkali metal salts are soluble.

For each pair, write the possible products formed by exchanging ions (double displacement reaction). For example, BaCl_2 and Na_2SO_4 can form BaSO_4 and NaCl.

Check the solubility of each product using the solubility rules. If any product is insoluble, a precipitate forms. For example, BaSO_4 is insoluble and will precipitate.

Identify the combination where both possible products are soluble, meaning no precipitate forms. In this case, NaNO_3 and KCl both produce ions that remain dissolved, so no precipitate forms.