Free Printable Naming Ionic Compounds Worksheets - Free Printable

Let's solve this Complex Ionic Compounds Worksheet step by step. The goal is to identify the positive ion (cation), the negative ion (anion), and then write the compound name for each formula.

We'll go through each compound one by one.

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1. NaNO₃

- Positive Ion: Na⁺ → Sodium
- Negative Ion: NO₃⁻ → Nitrate (a polyatomic ion)
- Compound Name: Sodium nitrate

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2. KOH

- Positive Ion: K⁺ → Potassium
- Negative Ion: OH⁻ → Hydroxide (complex ion)
- Compound Name: Potassium hydroxide

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3. MgSO₄

- Positive Ion: Mg²⁺ → Magnesium
- Negative Ion: SO₄²⁻ → Sulfate
- Compound Name: Magnesium sulfate

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4. CaCO₃

- Positive Ion: Ca²⁺ → Calcium
- Negative Ion: CO₃²⁻ → Carbonate
- Compound Name: Calcium carbonate

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5. Sr(NO₃)₂

- Positive Ion: Sr²⁺ → Strontium
- Negative Ion: NO₃⁻ → Nitrate
- Compound Name: Strontium nitrate

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6. Li₂CO₃

- Positive Ion: Li⁺ → Lithium
- Negative Ion: CO₃²⁻ → Carbonate
- Compound Name: Lithium carbonate

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7. Na₂CrO₄

- Positive Ion: Na⁺ → Sodium
- Negative Ion: CrO₄²⁻ → Chromate
- Compound Name: Sodium chromate

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8. K₃PO₄

- Positive Ion: K⁺ → Potassium
- Negative Ion: PO₄³⁻ → Phosphate
- Compound Name: Potassium phosphate

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9. (NH₄)₃PO₄

- Positive Ion: NH₄⁺ → Ammonium (complex cation)
- Negative Ion: PO₄³⁻ → Phosphate
- Compound Name: Ammonium phosphate

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10. Al(OH)₃

- Positive Ion: Al³⁺ → Aluminum
- Negative Ion: OH⁻ → Hydroxide
- Compound Name: Aluminum hydroxide

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11. Mg₃(PO₄)₂

- Positive Ion: Mg²⁺ → Magnesium
- Negative Ion: PO₄³⁻ → Phosphate
- Compound Name: Magnesium phosphate

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12. Zn(ClO₃)₂

- Positive Ion: Zn²⁺ → Zinc
- Negative Ion: ClO₃⁻ → Chlorate
- Compound Name: Zinc chlorate

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13. Ca₃(PO₄)₂

- Positive Ion: Ca²⁺ → Calcium
- Negative Ion: PO₄³⁻ → Phosphate
- Compound Name: Calcium phosphate

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14. Al₂(SO₄)₃

- Positive Ion: Al³⁺ → Aluminum
- Negative Ion: SO₄²⁻ → Sulfate
- Compound Name: Aluminum sulfate

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15. Al₂(CrO₄)₃

- Positive Ion: Al³⁺ → Aluminum
- Negative Ion: CrO₄²⁻ → Chromate
- Compound Name: Aluminum chromate

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✔ Final Answer 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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🔍 Explanation:

- Complex ions are ions that contain more than one atom and have a net charge. Examples:
- Polyatomic anions: NO₃⁻ (nitrate), SO₄²⁻ (sulfate), CO₃²⁻ (carbonate), PO₄³⁻ (phosphate), CrO₄²⁻ (chromate), OH⁻ (hydroxide), ClO₃⁻ (chlorate).
- Polyatomic cations: NH₄⁺ (ammonium).

- When naming ionic compounds:
- Name the cation first, then the anion.
- For simple metal cations (like Na⁺, K⁺, Ca²⁺), use the element name.
- For transition metals with variable charges, you'd use Roman numerals (but not needed here since all metals shown have fixed charges).
- Anions end in "-ide" for simple ions (e.g., Cl⁻ → chloride), but polyatomic ions have their own names (e.g., NO₃⁻ → nitrate).

This worksheet focuses on recognizing common complex ions and applying standard naming rules.

Let me know if you want help memorizing these ions!