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Description
Sodium 3-Hydroxybenzoate is the sodium salt of 3-hydroxybenzoic acid, the ionised form obtained when the carboxyl group of the parent compound is neutralised with a sodium base. The change from free acid to salt carries important practical consequences in the laboratory, particularly for solubility and ease of handling. As a non-heterocyclic building block, the compound supplies an aromatic framework bearing a hydroxyl group at the meta position — an arrangement that gives reactivity patterns and electronic properties different from those of the more commonly encountered para isomer, making it useful to researchers who wish to compare the influence of substituent placement.
The most prominent property, and the main reason the salt is selected, is its good solubility in water, far exceeding that of the free acid. This considerably simplifies the preparation of aqueous solutions without requiring an additional organic solvent or a separate neutralisation step, so the workflow becomes more compact and solvent waste is reduced. The salt form also tends to be more stable in solid storage and is not sharply odorous, which makes it comfortable to handle at the bench. The meta placement of the hydroxyl group further makes it a distinct reference point when substitution effects are being studied.
In Indonesian laboratories the material is ordinarily encountered in university chemistry departments, research institutes, and industrial development units that carry out organic synthesis and aqueous formulation work. Its water solubility suits settings where organic solvent supply, extraction facilities, and solvent waste disposal are limiting factors. Analysts also value a solid reagent that dissolves directly in water for preparing standard and comparison solutions without extra preparatory steps.
Laboratory Applications
Organic synthesis building block — the meta-substituted aromatic ring provides a defined hydroxyl and carboxylate framework onto which further functional groups can be introduced during the construction of more complex target molecules.
Aqueous-phase reaction studies — because the salt dissolves readily in water, reactions and treatments can be conducted in aqueous media directly, avoiding the organic solvents that the corresponding free acid would require.
Substituent position comparison studies — researchers examining how meta versus para placement alters reactivity and electronic behaviour can use this compound as the meta reference against the more familiar para isomer.
Standard and comparison solution preparation — the solid dissolves in water without a separate neutralisation step, which shortens preparation time and reduces the number of steps where error may be introduced.
Teaching and demonstration work in organic chemistry — the pairing of free acid and salt form illustrates clearly how ionisation changes solubility and handling behaviour for students at the bench.
Specifications
Brand: TCI
CAS number: 7720-19-6
Catalogue code: H0220
Category: Chemistry > Building Blocks > Non-Heterocyclic Building Blocks
Physical form: solid
Pack sizes: available in the standard research pack sizes offered by TCI for this catalogue item
Storage: keep in a closed container in a dry place, away from moisture
Handling and Storage
Store the material in its original tightly closed container in a cool, dry place with good ventilation, protected from moisture, since the salt form is hygroscopic in character and should be kept away from damp air. Glass or chemically resistant plastic containers with well-sealing caps are suitable; label every secondary container clearly with the compound name and CAS number. Handle within a fume hood or a well-ventilated area, and wear standard personal protective equipment including a laboratory coat, safety goggles, and chemically resistant gloves. Avoid raising dust when weighing out the solid, close the container immediately after use, and consult the manufacturer's safety data sheet before first use and before waste disposal.
