2,4-dichlorophenoxyacetic acid sodium

2,4-Dichlorophenoxyacetic Acid Sodium Salt (CAS No. 2702-72-9) 

1. Basic Information

Chemical Name: Sodium 2,4-dichlorophenoxyacetateSynonyms: 2,4-D sodium salt; Sodium 2,4-DCAS Number: 2702-72-9Molecular Formula: C₈H₅Cl₂NaO₃Molecular Weight: 243.02 g/molAppearance: White to tan crystalline powderOdor: Odorless

2. Physical and Chemical Properties

Property	Value/Description
Melting Point	215–218°C (dec.)
Solubility	– Water: ~600 g/L (20°C)
	– Organic solvents: Low solubility
pH (1% solution)	7.0–9.0
Density	1.48 g/cm³
Vapor Pressure	Negligible

3. Hazards (GHS Classification)

Acute Toxicity: Harmful if swallowed (H302)Eye Irritation: Causes serious eye irritation (H319)Environmental Hazards:Very toxic to aquatic life (H400)Persistent in soil (H412)NFPA Rating: Health 2, Flammability 1, Reactivity 0

4. Storage and Handling

Storage:Tightly sealed in corrosion-resistant containersStore in cool, dry place away from acidsHandling:Use nitrile gloves and safety gogglesAvoid dust generation

5. Applications

Herbicide: Selective weed control in agriculturePlant Growth Regulator: Stimulates fruit developmentResearch: Auxin analog in plant physiology studies

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