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
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.