Acetic Acid Dissociation in Water

CH3COOH + H2O ⇌ CH3COO− + H3O+

ภาพรวม

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.

ผู้เข้าร่วม

บทบาท สาร สัมประสิทธิ์ สถานะ
สารตั้งต้น Acetic Acid CH₃COOH 1 (aq)
สารตั้งต้น Water H₂O 1 (l)

ตัวอย่างในชีวิตประจำวัน

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

ความสำคัญทางอุตสาหกรรม

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

คุณสมบัติ

ประเภท
Acid-Base
ย้อนกลับได้
ใช่
พลังงาน
ดูดความร้อน
ΔH
0.4 kJ/mol

ปฏิกิริยาที่เกี่ยวข้อง

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.