Acetic Acid Dissociation in Water
CH3COOH + H2O ⇌ CH3COO− + H3O+
Visão geral
Acetic acid partially dissociates in water with Ka = 1.8 × 10⁻⁵, meaning only about 1.3% of molecules ionize in a 1 M solution. This equilibrium is the archetypal weak acid dissociation used to teach acid ionization constants, ICE tables, and the relationship between Ka and pH.
Participantes
| Papel | Substância | Coeficiente | Estado |
|---|---|---|---|
| Reagente | Acetic Acid CH₃COOH | 1 | (aq) |
| Reagente | Water H₂O | 1 | (l) |
Exemplo do cotidiano
Vinegar (5% acetic acid) has a pH around 2.4 because the weak acid only partially ionizes, unlike strong acids that fully dissociate.
Importância industrial
A compreensão dos equilíbrios de ácidos fracos é essencial para formular soluções tampão, preparações farmacêuticas e controlar o pH em processos de fermentação.
Propriedades
- Tipo
- Acid-Base
- Reversível
- Sim
- Energia
- Endotérmico
- ΔH
- 0,4 kJ/mol
Reações relacionadas
Ammonia and Hydrochloric Acid
Ascorbic Acid and Sodium Hydroxide
Barium Hydroxide and Ammonium Thiocyanate (Endothermic)
Carbonic Acid and Sodium Hydroxide
Aluminum Hydroxide as Amphoteric Acid with NaOH
Aluminum Chloride and Chloride Ion (Lewis Acid-Base)
Hydrochloric Acid and Sodium Hydroxide Neutralization
Nitric Acid and Potassium Hydroxide Neutralization
Magnesium Hydroxide and Hydrochloric Acid (Milk of Magnesia)
Hydrochloric Acid and Barium Hydroxide
Frequently Asked Questions
What is the equation for Acetic Acid Dissociation in Water?
The balanced equation is: CH₃COOH + H₂O ⇌ CH₃COO⁻ + H₃O⁺.
What type of reaction is Acetic Acid Dissociation in Water?
Acetic Acid Dissociation in Water is a acid-base reaction. It is reversible under certain conditions.
Is Acetic Acid Dissociation in Water exothermic or endothermic?
Acetic Acid Dissociation in Water is endothermic (absorbs energy). The enthalpy change (ΔH) is 0.4 kJ/mol.