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 (a polyatomic 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 (a polyatomic 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 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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🔍 Explanation:

- Cations (positive ions): These are typically metals or ammonium (NH₄⁺). Their names remain unchanged.
- Anions (negative ions): These are often polyatomic ions like nitrate (NO₃⁻), sulfate (SO₄²⁻), phosphate (PO₄³⁻), etc.
- Naming Rule: For ionic compounds, the cation is named first, followed by the anion with "-ide" ending (or the name of the polyatomic ion).
- When the anion is a polyatomic ion, use its specific name (e.g., "nitrate", "phosphate").

This worksheet focuses on complex ions, meaning it includes polyatomic ions such as NO₃⁻, SO₄²⁻, PO₄³⁻, OH⁻, etc., which are common in chemistry.

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