In Class 10 and 11 Chemistry, acids and bases are classified as strong or weak based on how completely they dissociate in water. This is different from concentrated vs dilute.
Weak Acid: Partially ionizes — CH₃COOH (vinegar), H₂CO₃.
Weak Base: Partially ionizes — NH₄OH (ammonia), Mg(OH)₂.
Strong ≠ Concentrated: Strength = degree of ionization. Concentration = amount dissolved.
A Weak Acid is one that does NOT completely dissociate (ionize) into ions when dissolved in water. Only a small fraction of its molecules break apart.
Examples of Weak Acids:
Strong Acids (for comparison): HCl, H₂SO₄, HNO₃ — completely dissociate in water.
A Weak Base is one that does NOT completely dissociate in water — only a small fraction produces OH⁻ ions.
Examples of Weak Bases:
Strong Bases (for comparison): NaOH, KOH — completely dissociate in water.
| Property | Strong Acid/Base | Weak Acid/Base |
|---|---|---|
| Dissociation | Complete (100%) | Partial (small %) |
| pH of acid | Very low (0-2) | Moderate (3-6) |
| Conductivity | High | Low |
| Example | HCl, NaOH | CH₃COOH, NH₄OH |
A weak acid is one that only partially dissociates in water, producing few H⁺ ions. Examples: Acetic acid (CH₃COOH) found in vinegar, and Carbonic acid (H₂CO₃) found in fizzy drinks.
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