Comprehensive chemistry practice sheet for identifying and classifying acids, bases, and salts.

Here is the complete solution to both parts of your worksheet, based on Arrhenius definitions and standard acid/base/salt classifications.

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## ✔ PART 1: Using the Arrhenius Definition

> Arrhenius Definition:
> - Acid: A substance that dissociates in water to produce H⁺ ions.
> - Base: A substance that dissociates in water to produce OH⁻ ions.
> - Salt: An ionic compound formed from the reaction of an acid and a base; contains neither H⁺ nor OH⁻ as the primary ion (though may contain them as part of polyatomic ions).

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🔢 Classification:

| # | Compound | Classification |
|---|--------------|----------------|
| 1 | HBr | Acid |
| 2 | Mg(OH)₂ | Base |
| 3 | HCl | Acid |
| 4 | KNO₂ | Salt |
| 5 | HI | Acid |
| 6 | Ba(OH)₂ | Base |
| 7 | KCl | Salt |
| 8 | H₃PO₄ | Acid |
| 9 | HClO | Acid |
|10 | Al(OH)₃ | Base |
|11 | KC₂H₃O₂ | Salt |
|12 | NaCl | Salt |

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📝 Notes:

- All compounds starting with H (except some like H₂O or CH₄) are typically acids — they release H⁺.
- Compounds ending in (OH) are bases — they release OH⁻.
- Salts are ionic compounds made of cations (like K⁺, Na⁺, Ca²⁺) and anions (like Cl⁻, NO₃⁻, C₂H₃O₂⁻) — products of neutralization reactions.

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## ✔ PART 2: Classify each compound + strength/type

> For acids and bases: indicate strong or weak.
> For salts: indicate whether the aqueous solution is acidic, basic, or neutral.

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🔢 Complete Classification:

| # | Compound | Type | Strength / Nature | Explanation |
|---|--------------|--------|--------------------------|-----------|
| 1 | HNO₃ | Acid | Strong | One of the 7 strong acids. Fully dissociates. |
| 2 | NaOH | Base | Strong | Strong base (Group 1 hydroxide). |
| 3 | NaNO₃ | Salt | Neutral | From strong acid (HNO₃) + strong base (NaOH) → neutral salt. |
| 4 | KOH | Base | Strong | Strong base (Group 1 hydroxide). |
| 5 | H₂S | Acid | Weak | Weak diprotic acid; partial dissociation. |
| 6 | Al(NO₃)₃ | Salt | Acidic | Al³⁺ hydrolyzes water → acidic solution. |
| 7 | H₂SO₄ | Acid | Strong | Strong acid (first proton only; second is weak, but overall classified as strong). |
| 8 | CaCl₂ | Salt | Neutral | From strong acid (HCl) + strong base (Ca(OH)₂) → neutral salt. |
| 9 | H₃PO₄ | Acid | Weak | Triprotic weak acid; partial dissociation. |
|10 | H₂CO₃ | Acid | Weak | Carbonic acid — very weak, unstable. |
|11 | NH₄OH | Base | Weak | Actually NH₃(aq); weak base. “NH₄OH” is outdated notation. |
|12 | NH₄Cl | Salt | Acidic | NH₄⁺ hydrolyzes → acidic solution. |
|13 | FeBr₃ | Salt | Acidic | Fe³⁺ hydrolyzes → acidic solution. |
|14 | HF | Acid | Weak | Only weak acid among halogen acids. |
|15 | H₂Se | Acid | Weak | Similar to H₂S; weak diprotic acid. |
|16 | HMnO₄ | Acid | Strong | Permanganic acid — strong acid (like HClO₄). |

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## 🧠 Key Concepts Recap:

💡 Strong Acids (Memorize these 7):

- HCl, HBr, HI, HNO₃, H₂SO₄, HClO₄, HMnO₄

💡 Strong Bases:

- Group 1 hydroxides: LiOH, NaOH, KOH, RbOH, CsOH
- Heavy Group 2 hydroxides: Ca(OH)₂, Sr(OH)₂, Ba(OH)₂

💡 Salt pH Rules:

- Neutral salt: Strong acid + Strong base (e.g., NaCl, KNO₃)
- Acidic salt: Strong acid + Weak base (e.g., NH₄Cl, Al(NO₃)₃)
- Basic salt: Weak acid + Strong base (e.g., NaC₂H₃O₂, KCN)

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✔ All answers are now filled in correctly according to Arrhenius theory and standard chemical behavior.

Let me know if you’d like a printable version or flashcards for memorizing strong acids/bases!