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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

3. Chemical Reactions

Naming Ionic Compounds

General Chemistry

3. Chemical Reactions

Naming Ionic Compounds

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Multiple Choice

Which of the following is the correct chemical formula for barium phosphate?

Ba3(PO4)2

Ba2(PO4)3

Ba(PO4)2

BaPO4

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Identify the ions involved: barium is a metal that forms a cation with a charge of +2, written as Ba^{2+}, and phosphate is a polyatomic ion with the formula PO_4^{3-}.

Determine the charges of the ions: Ba^{2+} has a +2 charge, and PO_4^{3-} has a -3 charge. The compound must be electrically neutral overall.

Find the lowest common multiple (LCM) of the charges 2 and 3, which is 6. This means the total positive charge and total negative charge must each sum to 6 to balance the compound.

Calculate the number of each ion needed to balance the charges: to get +6 from Ba^{2+}, you need 3 barium ions (3 × +2 = +6), and to get -6 from PO_4^{3-}, you need 2 phosphate ions (2 × -3 = -6).

Write the formula by placing the number of ions as subscripts: Ba_3(PO_4)_2, which shows 3 barium ions and 2 phosphate ions combined to form a neutral compound.