4-Hydroxybenzenesulfonic Acid TCI P0104

Chemical Identity

CAS No.: 98-67-9
PubChem: CID 4765·SID 87574361
Formula: C6H6O4S
Molecular weight: 174.18 g/mol
Purity: >85.0%(T)(HPLC)
Reference databases: ChEBI·ChemSpider·ECHA

Full identifiers (IUPAC, SMILES, InChIKey)

IUPAC: 4-hydroxybenzenesulfonic acid
SMILES: C1=CC(=CC=C1O)S(=O)(=O)O
InChIKey: FEPBITJSIHRMRT-UHFFFAOYSA-N

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CoA (Certificate of Analysis)

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4-Hydroxybenzenesulfonic Acid from TCI (product code P0104), also known as p-phenolsulfonic acid, is an aromatic compound with a phenolic hydroxyl group and a sulfonic acid group in the para positions of a benzene ring. In the laboratory it is used as a non-heterocyclic building block for synthesizing dyes, polymers, and other intermediates. It is also a well-known strong organic acid, used as a catalyst and as a component of electroplating solutions.

Chemists choose this material because it combines the strong acidity of a sulfonic acid group with the reactivity of a phenol. The sulfonic acid group makes the compound highly soluble in water and gives it strong acidic character. The phenolic hydroxyl group allows further reactions, such as condensation with aldehydes. Phenolsulfonic acid products like this one are often supplied as aqueous solutions. Check the label and the Certificate of Analysis for the exact form and concentration before you calculate reaction quantities, so your stoichiometry is based on the material you actually have.

In Indonesia, this material is relevant to research laboratories working in organic chemistry, polymer chemistry, and electrochemical engineering, including work on metal coatings such as tin plating. University teaching and research groups can use it to study aromatic substitution and condensation chemistry. Industrial and process-development laboratories can use it to test acid-catalyzed reactions and plating bath formulations. The reliable TCI catalog identity and CAS number 98-67-9 make it easy to document in research records and quality procedures.

Related TCI products

Dye synthesis: the sulfonated aromatic ring and the reactive phenol group make it a useful non-heterocyclic building block for preparing water-soluble dyes and related colored intermediates.
Polymer and resin research: its phenolic hydroxyl group can condense with aldehydes, so researchers can use it to build sulfonated phenolic polymers with improved water solubility.
Acid catalysis: as a strong, water-soluble organic acid, it can catalyze acid-promoted reactions where a sulfonic acid catalyst is preferred over mineral acids.
Electroplating solution development: it is known as a component of electroplating baths, which makes it relevant for laboratories developing and testing metal coatings such as tin plating.
Synthesis of organic intermediates: having both sulfonic acid and phenol groups on one ring gives chemists two separate reactive sites for building more complex aromatic intermediates.

Brand	TCI (product code P0104)
CAS number	98-67-9
Molecular formula	—
Purity	—
Category	Chemistry > Building Blocks > Non-Heterocyclic Building Blocks
Pack sizes	see the available options on the product listing
Physical form	often supplied as an aqueous solution; check the label and Certificate of Analysis for the exact form and concentration
Storage	follow the conditions on the product label and the Safety Data Sheet

Keep the container tightly closed in a cool, dry, well-ventilated area, away from bases, strong oxidizing agents, and reactive metals. Keep the material in its original container or in a chemically resistant, acid-compatible container that is clearly labeled. As a strong acid, it can be corrosive to skin, eyes, and some metals. Wear chemical-resistant gloves, safety goggles, and a lab coat, and handle it in a fume hood or another well-ventilated area. Avoid breathing vapors or mists. Clean up spills promptly using suitable absorbent materials. Always read the Safety Data Sheet before use, and dispose of waste according to local regulations.

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