Syre-stinkskabe GB - Flipbook - Side 11
WHAT DEFINES STRONG AND WEAK ACIDS?
Strong and weak acids are defined by their ability to
dissociate (ionize) in an aqueous solution, meaning how
completely they release their protons (H⁺ ions) in water.
STRONG ACIDS
- Definition: A strong acid is an acid that completely dissociates in water. This means that when a strong acid
is dissolved in water, almost all acid molecules release
H⁺ ion, resulting in a high concentration of H⁺ ions in
the solution.
- Examples of strong acids: Hydrochloric acid (HCl),
Sulfuric acid (H₂SO₄), Nitric acid (HNO₃), Perchloric acid
(HClO₄)
KEY DIFFERENCES
- Dissociation: Strong acids completely dissociate, while
weak acids only partially dissociate.
- pH: A solution of a strong acid will have a lower pH
value (more acidic) than a solution of a weak acid at
the same concentration.
- Acid Strength: This is often quantified using the acid
dissociation constant (K2). Strong acids have very high
K-values, while weak acids have lower K-values.
WEAK ACIDS
- Definition: A weak acid is an acid that only partially
dissociates in water. In a solution of a weak acid, only
a small fraction of the acid molecules release H⁺ ion,
meaning that there is a lower concentration of H⁺ ions
compared to a strong acid.
- Examples of weak acids: Acetic acid (CH₃COOH), Formic
acid (HCOOH), Citric acid (C₆H₈O₇)
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