Weak Acid
| Formula / Notation | Weak acid: Ka << 1; pH = ½(pKa - log c) |
|---|---|
| Also Known As | Partially dissociating acid, weak electrolyte acid, partial acid |
What is Weak Acid?
An acid that only partially dissociates in aqueous solution, establishing an equilibrium between undissociated acid molecules and hydrogen ions. Characterized by a small Ka value. Examples include acetic acid (Ka = 1.8 × 10⁻⁵), carbonic acid, and hydrofluoric acid.
Formula & Notation
Other Names / Synonyms: Partially dissociating acid, weak electrolyte acid, partial acid
Properties & Characteristics
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
An acid that only partially dissociates in aqueous solution, establishing an equilibrium between undissociated acid molecules and hydrogen ions. Characterized by a small Ka value. Examples include acetic acid (Ka = 1.8 × 10⁻⁵), carbonic acid, and hydrofluoric acid.
Weak acids are used in buffer solutions that resist pH change, important in biological systems and chemical manufacturing. Acetic acid (weak acid) is used as a food preservative and in the production of vinyl acetate. Carbonic acid regulates blood pH in the bicarbonate buffering system.
Weak acids are generally less immediately corrosive than strong acids but can still cause irritation and chemical burns with prolonged contact. Hydrofluoric acid, though weak, is exceptionally dangerous due to fluoride ion penetration into tissue.
The formula or notation for Weak Acid is: Weak acid: Ka