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Sulfanilic acid

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Identification
Molecular formula
C7H9NO3S
CAS number
121-57-3
IUPAC name
4-amino-3-methyl-benzenesulfonic acid
State
State

At room temperature, sulfanilic acid is typically found in the solid state, specifically as a crystalline solid. The compound is stable under standard conditions of temperature and pressure.

Melting point (Celsius)
288.00
Melting point (Kelvin)
561.15
Boiling point (Celsius)
300.00
Boiling point (Kelvin)
573.15
General information
Molecular weight
173.20g/mol
Molar mass
173.1950g/mol
Density
1.4850g/cm3
Appearence

Sulfanilic acid appears as a white to slightly beige powder or crystalline solid. It tends to darken upon exposure to light. This compound is often available as fine crystals or as crystalline powder, which can give it a somewhat glistening appearance in bulk form.

Comment on solubility

Solubility of 4-amino-3-methyl-benzenesulfonic acid

4-amino-3-methyl-benzenesulfonic acid, also known as methyl-para-aminobenzenesulfonic acid, is notable for its solubility characteristics in water and organic solvents.

This compound exhibits good solubility in water, which can be attributed to the presence of its sulfonic acid group. The sulfonic acid functional group (-SO3H) is highly polar and ionizable, allowing it to interact favorably with water molecules. This interaction leads to the compound being effectively soluble under various conditions.

When considering its solubility, it is essential to keep in mind:

  • Temperature: Increased temperatures generally enhance solubility.
  • pH Levels: The ionization of the sulfonic acid can vary with pH, affecting solubility in different environments.
  • Concentration: Higher concentrations may lead to saturation, limiting further dissolution.

In organic solvents, the solubility may vary but tends to be lower compared to water, primarily due to the compound’s hydrophilic nature. Thus, when exploring its applications, it is crucial to consider the solvent environment to maximize efficacy.

In summary, 4-amino-3-methyl-benzenesulfonic acid is readily soluble in water, making it a suitable candidate for various biochemical applications, while its behavior in organic solvents might present challenges.

Interesting facts

Interesting Facts about 4-Amino-3-Methyl-Benzenesulfonic Acid

4-Amino-3-methyl-benzenesulfonic acid, often referred to as p-toluidinesulfonic acid, is a fascinating compound with several notable attributes and applications in the field of chemistry.

Key Features:

  • Dual Functionality: This compound acts as an amino acid and a sulfonic acid, allowing it to participate in a variety of chemical reactions.
  • Role in Dyes: It serves as an important intermediate in the synthesis of azo dyes, which are extensively used in the textile and food industries.
  • Buffering Agent: Due to its acid-base properties, it can function as a buffering agent in biochemical applications.
  • Biochemical Importance: It is utilized in the preparation of various biologically active molecules, highlighting its relevance to pharmaceuticals and biochemistry.

Applications:

  • Used in dye manufacturing for creating vibrant colors.
  • Actively involved in the production of photographic chemicals.
  • Involved in the formulation of some hair dyes, demonstrating its versatility.

As a compound that bridges the gap between organic chemistry and industrial applications, 4-amino-3-methyl-benzenesulfonic acid showcases how intricate molecular designs can lead to practical uses in everyday life. Its ability to engage in different chemical pathways allows chemists to explore new possibilities in synthesis and material science.

In the words of chemist Robert H. Grubbs, "Discoveries in chemistry often lead to unexpected applications that can revolutionize industries." This compound exemplifies that sentiment by contributing significantly to various fields.

Synonyms
98-33-9
4-Amino-3-methylbenzenesulfonic acid
2-Aminotoluene-5-sulfonic acid
Benzenesulfonic acid, 4-amino-3-methyl-
4-Amino-m-toluenesulfonic acid
2-Amino-5-toluenesulfonic acid
6-Aminotoluene-3-sulfonic acid
o-Toluidine-m-sulfonic acid
m-Toluenesulfonic acid, 4-amino-
CCRIS 3412
UNII-ET833CB2KU
NSC 7545
EINECS 202-658-6
ET833CB2KU
4-Amino-m-toluenesulfonic acid (SO3H=1)
AI3-16579
4-Amino-meta-toluenesulfonic acid (SO3H=1)
NSC-7545
o-Toluidine-4-sulfonic acid
2-METHYL-4-SULFOANILINE
2-methylaniline-4-sulfonic acid
4-AMINO-3-METHYLBENZENESULPHONIC ACID
DTXSID5059167
4-Amino-meta-toluenesulfonic acid [SO3H=1]
3-Methylsulphanilic acid
4-Amino-m-toluenesulfonic acid [SO3H=1]
MFCD00025198
SCHEMBL152490
DTXCID2049050
NSC7545
4-amino-3-methyl-benzenesulfonate
4-Amino-3-methylbenzenesulfonicacid
AAA09833
4-amino-3-methyl-benzenesulfonic acid
AKOS009156761
PS-8456
4-amino-3-methylbenzene-1-sulfonic acid
AC-22497
DB-080512
NS00022919
E78689
Q27277356
202-658-6