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Sodium Diacetate
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Description
Sodium Diacetate
Other Names: Sodium hydrogen diacetate, Acetic acid sodium salt complex
CAS Number: 126-96-5
Sum Formula: C₄H₇NaO₄
Molar Mass: 142.09 g/mol
Appearance: White, crystalline powder with a vinegar-like odor
Sodium diacetate is a stable, crystalline compound consisting of a 1:1 molar mixture of sodium acetate and acetic acid. It is used in industrial applications requiring controlled acidity, buffering properties, or mild antimicrobial action. It dissolves readily in water and is compatible with a wide range of chemical formulations.
Chemical and Physical Properties
Density: ~1.45 g/cm³
Melting Point: ~120°C (decomposes)
Solubility in Water: Soluble (approximately 500 g/L at 20°C)
Odor: Characteristic acetic (vinegar-like)
pH (1% solution): ~4.5–5.5
Stability: Hygroscopic; stable under dry conditions
Applications
Used as an acidulant and buffering agent in industrial formulations
Applied in de-icing and anti-corrosion products
Utilized in textile processing and leather treatment as a pH regulator
Acts as a descaling or cleaning component in technical detergents
Employed in odor control and waste treatment systems
Safety
Signal Word: Warning
P264+P265, P280, P305+P354+P338, and P317
First Aid Measures
Eye Contact: Rinse immediately with water for at least 15 minutes. Seek medical attention
Skin Contact: Wash with soap and water. Remove contaminated clothing
Inhalation: Move to fresh air. Seek medical help if symptoms occur
Ingestion: Rinse mouth with water. Do not induce vomiting. Seek medical advice
Handling and Storage
Store in a dry, cool, well-ventilated area in tightly closed containers
Protect from moisture and incompatible substances (strong oxidizers, acids)
Use personal protective equipment to avoid dust contact with skin and eyes