Free Printable Naming Ionic Compounds Worksheets - Free Printable

Here is the completed Complex Ionic Compounds Worksheet, with explanations for each compound.

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✔ Key Concepts:

- Complex ions are polyatomic ions — groups of atoms with an overall charge (e.g., NO₃⁻, SO₄²⁻, OH⁻, PO₄³⁻).
- In ionic compounds, the positive ion (cation) is usually a metal or ammonium (NH₄⁺), and the negative ion (anion) is often a polyatomic ion.
- To name the compound:
→ Name the cation first (metal or NH₄⁺).
→ Name the anion second (polyatomic ion).
→ No prefixes (like mono-, di-) are used in ionic compound naming.

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## 📝 Completed Table:

| Formulas | Positive Ion | Negative Ion | Compound Name |
|-----------------|------------------|------------------|------------------------------|
| NaNO₃ | Na⁺ | NO₃⁻ | Sodium nitrate |
| KOH | K⁺ | OH⁻ | Potassium hydroxide |
| MgSO₄ | Mg²⁺ | SO₄²⁻ | Magnesium sulfate |
| CaCO₃ | Ca²⁺ | CO₃²⁻ | Calcium carbonate |
| Sr(NO₃)₂ | Sr²⁺ | NO₃⁻ | Strontium nitrate |
| Li₂CO₃ | Li⁺ | CO₃²⁻ | Lithium carbonate |
| Na₂CrO₄ | Na⁺ | CrO₄²⁻ | Sodium chromate |
| K₃PO₄ | K⁺ | PO₄³⁻ | Potassium phosphate |
| (NH₄)₃PO₄ | NH₄⁺ | PO₄³⁻ | Ammonium phosphate |
| Al(OH)₃ | Al³⁺ | OH⁻ | Aluminum hydroxide |
| Mg₃(PO₄)₂ | Mg²⁺ | PO₄³⁻ | Magnesium phosphate |
| Zn(ClO₃)₂ | Zn²⁺ | ClO₃⁻ | Zinc chlorate |
| Ca₃(PO₄)₂ | Ca²⁺ | PO₄³⁻ | Calcium phosphate |
| Al₂(SO₄)₃ | Al³⁺ | SO₄²⁻ | Aluminum sulfate |
| Al₂(CrO₄)₃ | Al³⁺ | CrO₄²⁻ | Aluminum chromate |

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## 🔍 Explanations for Key Examples:

1. NaNO₃
- Na⁺ = sodium ion
- NO₃⁻ = nitrate ion
→ Sodium nitrate

2. KOH
- K⁺ = potassium ion
- OH⁻ = hydroxide ion
→ Potassium hydroxide

3. MgSO₄
- Mg²⁺ = magnesium ion
- SO₄²⁻ = sulfate ion
→ Magnesium sulfate

4. Sr(NO₃)₂
- Sr²⁺ = strontium ion
- Two NO₃⁻ ions needed to balance charge → still named “nitrate”
→ Strontium nitrate

5. Li₂CO₃
- Two Li⁺ ions + one CO₃²⁻ ion → Lithium carbonate

6. Na₂CrO₄
- CrO₄²⁻ = chromate ion → Sodium chromate

7. K₃PO₄
- Three K⁺ ions + one PO₄³⁻ → Potassium phosphate

8. (NH₄)₃PO₄
- NH₄⁺ = ammonium ion → Ammonium phosphate

9. Al(OH)₃
- Al³⁺ + three OH⁻ → Aluminum hydroxide

10. Mg₃(PO₄)₂
- Three Mg²⁺ = +6 charge; two PO₄³⁻ = -6 → balanced → Magnesium phosphate

11. Zn(ClO₃)₂
- Zn²⁺ + two ClO₃⁻ → Zinc chlorate

12. Ca₃(PO₄)₂
- Common bone mineral → Calcium phosphate

13. Al₂(SO₄)₃
- Two Al³⁺ = +6; three SO₄²⁻ = -6 → Aluminum sulfate

14. Al₂(CrO₄)₃
- Two Al³⁺ = +6; three CrO₄²⁻ = -6 → Aluminum chromate

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✔ All names follow standard IUPAC nomenclature for ionic compounds with polyatomic (complex) ions.

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