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Chemical Formula:
C₁₀H₉NO₃S
Molecular Weight:
223.25 g/mol
Structure Description:
This compound consists of a naphthalene ring with an amino group (-NH₂) at position 2 and a sulfonic acid group (-SO₃H) at position 1.
Appearance:
It typically appears as an off-white to light brown crystalline powder.
Solubility:
It is soluble in water, slightly soluble in alcohol, and insoluble in ether.
Melting Point:
Decomposes at temperatures above 300°C.
pKa Values:
The sulfonic acid group has a very low pKa (~ -2), indicating strong acidity, while the amino group has a pKa around 4.5, indicating basic behavior.
Applications:
Tobias acid is widely used as an intermediate in the production of azo dyes, particularly for textiles, leather, and paper. It is also used in organic synthesis for diazo coupling reactions.
Safety Information:
The compound may be harmful if inhaled or ingested and may cause irritation to the eyes, skin, and respiratory system. It should be handled with protective equipment in a well-ventilated area and stored in a cool, dry place away from oxidizing agents.
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Panoli GIDC, Bharuch, Gujarat 
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