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Orange G

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Identification
Molecular formula
C16H10N2Na2O7S2
CAS number
1936-15-8
IUPAC name
3-hydroxy-4-[(1-hydroxy-8-sulfo-2-naphthyl)azo]naphthalene-1-sulfonic acid
State
State

At room temperature, Orange G is generally found in solid form due to its high melting point.

Melting point (Celsius)
300.00
Melting point (Kelvin)
573.00
Boiling point (Celsius)
0.00
Boiling point (Kelvin)
0.00
General information
Molecular weight
452.38g/mol
Molar mass
452.3790g/mol
Density
1.5250g/cm3
Appearence

Orange G is an orange to red-brown powder or granule. It is known for its vibrant color and is commonly used as a dye.

Comment on solubility

Solubility of 3-hydroxy-4-[(1-hydroxy-8-sulfo-2-naphthyl)azo]naphthalene-1-sulfonic acid

The solubility of 3-hydroxy-4-[(1-hydroxy-8-sulfo-2-naphthyl)azo]naphthalene-1-sulfonic acid exhibits some intriguing characteristics, influenced by its chemical structure and functional groups. This compound, known for its complex molecular formation, tends to be soluble in specific solvents due to the following reasons:

  • Presence of Sulfonic Groups: The sulfonic acid groups (-SO3H) contribute significantly to its hydrophilicity, enhancing water solubility.
  • Hydroxyl Groups: Hydroxyl (-OH) groups also increase solubility in polar solvents by forming hydrogen bonds with water molecules.
  • Aromatic Structure: Despite the presence of hydrophobic naphthalene rings, the polar functionalization overrides the hydrophobic effect, making the compound more soluble in aqueous solutions.
  • pH Sensitivity: The solubility can vary with pH levels, as the ionization of the sulfonic acid group can increase solubility in acidic to neutral pH environments.

In summary, 3-hydroxy-4-[(1-hydroxy-8-sulfo-2-naphthyl)azo]naphthalene-1-sulfonic acid is generally soluble in water and other polar solvents due to its functional groups, which promote interactions with solvent molecules. The balance between its hydrophilic and hydrophobic portions plays a vital role in determining its overall solubility profile.

Interesting facts

Interesting Facts about 3-hydroxy-4-[(1-hydroxy-8-sulfo-2-naphthyl)azo]naphthalene-1-sulfonic acid

3-hydroxy-4-[(1-hydroxy-8-sulfo-2-naphthyl)azo]naphthalene-1-sulfonic acid is a fascinating compound known for its vibrant color and intriguing properties. Here are some noteworthy points about this compound:

  • Azo Compounds: As part of the azo compound family, this compound features a characteristic -N=N- bond. Azo compounds are widely recognized for their use in dyes, particularly in textiles and food products, due to their stability and brightness.
  • Sulfonic Acid Functionality: The presence of sulfonic acid groups enhances the compound's solubility in water. This property is crucial for its applications in various industries, allowing for easier processing and use in aqueous environments.
  • Color Properties: This compound exhibits intense colors, making it valuable in dye production. The colorful nature arises from the electronic structure of the naphthalene moieties combined with the azo functional group.
  • Analytical Chemistry: 3-hydroxy-4-[(1-hydroxy-8-sulfo-2-naphthyl)azo]naphthalene-1-sulfonic acid is often utilized as a pH indicator in analytical chemistry due to its distinct color change at varying pH levels, enabling precise monitoring in titrations and other chemical analyses.
  • Environmental Considerations: As with many azo dyes, there are environmental concerns associated with their use. Some azo compounds can break down into amines that may be hazardous, prompting regulations and research for safer alternatives.

In summary, this compound's unique structure and properties not only make it essential in dye applications but also a subject of significant interest in environmental studies and analytical methods. As researchers continue to explore new applications and safety measures, compounds like 3-hydroxy-4-[(1-hydroxy-8-sulfo-2-naphthyl)azo]naphthalene-1-sulfonic acid remain integral to both industrial and educational chemistry.

Synonyms
DTXSID20867970
3-Hydroxy-4-[(1-hydroxy-8-sulfonaphthalen-2-yl)diazenyl]naphthalene-1-sulfonic acid