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Naphthionic acid

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Identification
Molecular formula
C10H9NO3S
CAS number
84-86-6
IUPAC name
5-aminonaphthalene-1-sulfonic acid
State
State

Naphthionic acid is a solid at room temperature. It is typically handled and stored in its solid form, often as a powder.

Melting point (Celsius)
300.00
Melting point (Kelvin)
573.00
Boiling point (Celsius)
650.00
Boiling point (Kelvin)
923.00
General information
Molecular weight
223.25g/mol
Molar mass
223.2480g/mol
Density
1.5380g/cm3
Appearence

Naphthionic acid appears as a white to light beige crystalline powder. It is slightly soluble in water, but soluble in dilute solutions of alkali hydroxides and carbonates. The compound can also appear slightly off-white or beige, which is common for sulfonated aromatic compounds due to impurities.

Comment on solubility

Solubility of 5-aminonaphthalene-1-sulfonic acid

5-aminonaphthalene-1-sulfonic acid is known for its intriguing solubility properties, primarily influenced by its molecular structure. The presence of both amino and sulfonic acid functional groups plays a crucial role in its interaction with solvents. Here are some key points regarding its solubility:

  • Solvent Polarity: This compound is more soluble in polar solvents such as water due to the ability of the sulfonic acid group to form hydrogen bonds.
  • pH Dependence: The solubility can vary significantly with pH. In acidic conditions, the sulfonic acid group remains protonated, which may enhance solubility.
  • Salt Formation: 5-aminonaphthalene-1-sulfonic acid can form salts with bases, increasing its solubility in specific media.
  • Concentration Effects: As concentration increases, there may be a shift in solubility due to intermolecular interactions.

Overall, the solubility of 5-aminonaphthalene-1-sulfonic acid underscores the principle that the structure and functional groups of a compound significantly dictate its behavior in various solvent systems. Thus, understanding these factors is essential for applications in chemical analysis and synthesis.

Interesting facts

Interesting Facts about 5-Aminonaphthalene-1-Sulfonic Acid

5-Aminonaphthalene-1-sulfonic acid is a fascinating compound with diverse applications in various fields of chemistry and industry. Here are some key points to consider:

  • Structure and Composition: This compound features a naphthalene ring, which is fused and comprises two aromatic rings. The presence of an amino group and a sulfonic acid group enhances its chemical reactivity and solubility in water.
  • Staining Agent: Due to its vibrant color properties, 5-aminonaphthalene-1-sulfonic acid is commonly used as a dye and an important component in coloring materials. It finds applications in textiles and various biological staining techniques.
  • pH Indicator: The compound can be utilized as a pH indicator in laboratory settings, allowing scientists to determine the acidity or alkalinity of a solution effectively.
  • Biochemical Research: Researchers often employ this compound in exploring biochemical pathways, as it can interact with certain metabolic processes. Its properties help investigate cellular functions and enzyme activities.
  • Environmental Applications: 5-Aminonaphthalene-1-sulfonic acid has applications in environmental science, particularly in the analysis of various pollutants and the development of sensors for detecting organic compounds.

In conclusion, 5-aminonaphthalene-1-sulfonic acid stands out not only for its chemical structure but also for its widespread use across multiple disciplines. Its versatility makes it a subject of interest for both chemists and industry professionals alike. As Marie Curie once said, “Nothing in life is to be feared; it is only to be understood.” Delving into such compounds allows for a greater understanding of both science and the world around us.

Synonyms
84-89-9
5-AMINO-1-NAPHTHALENESULFONIC ACID
5-aminonaphthalene-1-sulfonic acid
1-Naphthylamine-5-sulfonic acid
Laurent acid
1-Naphthalenesulfonic acid, 5-amino-
Laurent's acid
1-Amino-5-sulfonaphthalene
5-Naphthylamine-1-sulfonic acid
1-Amino-5-naphthalenesufonic acid
1-Aminonaphthalene-5-sulfonic acid
EINECS 201-571-0
UNII-W70WC365OD
NSC 28691
BRN 2214149
W70WC365OD
NSC-7553
5-Sulfo-1-naphthylamine
NSC-28691
CHEMBL589370
DTXSID7058911
1-Amino-5-naphthalenesulfonic acid
1-aminonaphthalene-5-sulphonic acid
4-14-00-02800 (Beilstein Handbook Reference)
5-Amino-1-naphthalenesulfonic Acid, 90%
1-NAPHTHYLAMINE-5-SULFONIC ACID [MI]
5-Aminonaphthalene-1-sulphonic acid
5NS
MFCD00014315
SCHEMBL147103
1-aminonaphthalene-5-sulfonate
1-amino-5-naphthalene sulfonate
DTXCID1048386
NSC7553
5-aminonaphthalene-1-sulonic acid
CHEBI:183820
NSC28691
BDBM50308731
STL481813
AKOS015902671
DB07176
AC-11003
AS-17221
PD005657
DB-056827
A0345
NS00038695
1-naphthylamine-5-sulfonic acid;laurent`s acid
5-Amino-1-naphthalenesulfonic acid, tech grade
D88250
EN300-123988
5-Amino-1-naphthalenesulfonic Acid, 90per cent
Q27096091
Z276161494
5-Amino-1-naphthalenesulfonic acid, technical, >=90% (T)
201-571-0