Acetic Acid Dissociation in Water

CH₃COOH + H₂O ⇌ CH₃COO⁻ + H₃O⁺

Tổng quan

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.

Người tham gia

Vai trò	Chất	Hệ số	Trạng thái
Chất phản ứng	Acetic Acid CH₃COOH	1	(aq)
Chất phản ứng	Water H₂O	1	(l)

Ví dụ thực tế

Vinegar (5% acetic acid) has a pH around 2.4 because the weak acid only partially ionizes, unlike strong acids that fully dissociate.

Tầm quan trọng công nghiệp

Understanding weak acid equilibria is essential for formulating buffer solutions, pharmaceutical preparations, and controlling pH in fermentation processes.

Tính chất

Loại: Acid-Base
Thuận nghịch: Có
Năng lượng: Thu nhiệt
ΔH: 0,4 kJ/mol

Phản ứng liên quan

Hydrochloric Acid and Barium Hydroxide Acetic Acid and Sodium Acetate Buffer System 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) Acetic Acid and Sodium Hydroxide Neutralization Formic Acid and Sodium 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.