Let’s go through each question one by one and solve them carefully.
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Question 1:
An Arrhenius acid forms
H⁺ ions in water.
Example given: HNO₃ → H + NO₃⁻
So for HCl (aq), it dissociates into H⁺ and Cl⁻.
→ Answer:
H⁺(aq) + Cl⁻(aq)
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Question 2:
An Arrhenius base forms
OH⁻ ions in water.
Example: KOH → K⁺ + OH⁻
So for NaOH (aq), it breaks into Na⁺ and OH⁻.
→ Answer:
Na⁺(aq) + OH⁻(aq)
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Question 3:
Salts don’t release H⁺ or OH — they release other ions.
Example: KCl → K⁺ + Cl⁻
So for NaCl (aq), it breaks into Na⁺ and Cl⁻.
→ Answer:
Na⁺(aq) + Cl⁻(aq)
Also, fill blanks: neither
H⁺ nor
OH⁻
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Question 4:
Strong conductivity = strong electrolyte → likely strong acid or base.
Reacts with metal to make hydrogen gas? That’s a classic property of
acids, especially strong ones.
Bases don’t typically react with metals to produce H₂ gas.
→ So answer is:
c) Strong Acid
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Question 5:
Slippery to touch? That’s a well-known property of
bases — like soap.
Acids are sour, not slippery. Water isn’t slippery. Electrolyte is too vague.
→ Answer:
b) Strong Base
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Question 6:
Hydronium ion is what you get when H⁺ attaches to water: H⁺ + H₂O → H₃O⁺
→ Answer:
a) H₃O⁺
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Question 7:
Changes color in acid or base? That’s exactly what a
pH indicator does (like litmus paper).
Neutralizer cancels out acid/base. Inhibitor slows reactions. Catalyst speeds up reactions.
→ Answer:
c) pH indicator
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Question 8: Name the acids and bases
- HF → Hydrofluoric acid
- KOH → Potassium hydroxide
- HNO₃ → Nitric acid
- Mg(OH)₂ → Magnesium hydroxide
*(Note: For naming acids, if it starts with H and has no oxygen, use “hydro-” prefix. If it has oxygen, use common names like nitric, sulfuric, etc. Bases are named as metal + hydroxide.)*
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Final Answer:
1. H⁺(aq) + Cl⁻(aq)
2. Na⁺(aq) + OH⁻(aq)
3. Neither H⁺ nor OH⁻; Na⁺(aq) + Cl⁻(aq)
4. c) Strong Acid
5. b) Strong Base
6. a) H₃O⁺
7. c) pH indicator
8.
- HF: Hydrofluoric acid
- KOH: Potassium hydroxide
- HNO₃: Nitric acid
- Mg(OH)₂: Magnesium hydroxide
Parent Tip: Review the logic above to help your child master the concept of acids bases and salts worksheet answers.
