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Acid Orange 7

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Identification
Molecular formula
C16H11N2NaO4S
CAS number
633-96-5
IUPAC name
6-hydroxy-5-(4-nitrophenyl)azo-naphthalene-2-sulfonic acid
State
State

At room temperature, Acid Orange 7 is typically a solid. It is not soluble in water but dissolves readily in alkali solutions.

Melting point (Celsius)
220.00
Melting point (Kelvin)
493.15
Boiling point (Celsius)
524.00
Boiling point (Kelvin)
797.15
General information
Molecular weight
350.32g/mol
Molar mass
350.3200g/mol
Density
1.4702g/cm3
Appearence

Acid Orange 7, also known as Orange II, typically appears as an orange to brown crystalline powder. It is widely used as a dye in various applications including textiles and inks.

Comment on solubility

Solubility of 6-hydroxy-5-(4-nitrophenyl)azo-naphthalene-2-sulfonic acid

6-hydroxy-5-(4-nitrophenyl)azo-naphthalene-2-sulfonic acid is a complex organic compound with unique solubility characteristics. The solubility of this compound can be influenced by several factors:

  • Polarity: The sulfonic acid group (-SO3H) contributes significantly to the polarity of the molecule, enhancing its solubility in polar solvents such as water.
  • Temperature: Increased temperature often leads to enhanced solubility of organic compounds in solvents. Thus, heating may positively affect the solubility of this compound in water.
  • pH Levels: The acidic nature of the sulfonic group means that the solubility can vary with the pH of the solution. In acidic conditions, the compound may exist in a less ionized form, while alkaline conditions could lead to increased ionization and thus improved solubility.
  • Presence of Other Solvents: The solubility can be further modified by the presence of organic solvents, where mixed solvent systems may provide a better solvation environment.

In summary, this compound is likely to be more soluble in aqueous solutions due to the influence of the sulfonic acid group. It is said that “the greater the charge, the greater the attraction for water,” making it highly soluble in polar environments. However, specific experimental data would provide the most accurate understanding of its solubility profile.

Interesting facts

Interesting Facts about 6-Hydroxy-5-(4-Nitrophenyl)azo-naphthalene-2-sulfonic Acid

6-Hydroxy-5-(4-nitrophenyl)azo-naphthalene-2-sulfonic acid, often referred to in the scientific community as a vibrant azo compound, possesses unique properties that make it notable within both research and industrial applications. Here are some fascinating aspects of this compound:

  • Azo Structure and Color: The azo group (-N=N-) is responsible for the rich visualization of colors in various compounds. The presence of nitrophenyl groups enhances its chromophoric properties, making it a key player in dye chemistry.
  • Applications: This compound is widely utilized in various fields, including:
    • Dyes and Pigments: Often leveraged for its vibrant coloring in textiles and paper industries.
    • Biological Staining: Employed in biological research for staining cells and tissues, aiding in microscopy techniques.
    • Indicators: Serves as a pH indicator in analytical chemistry, showcasing a distinct color change under different pH levels.
  • Research Significance: Scientists study 6-hydroxy-5-(4-nitrophenyl)azo-naphthalene-2-sulfonic acid for its acid-base behavior and potential use in creating novel compounds with advanced functionalities.
  • Toxicity Considerations: As with many azo dyes, researchers are aware of the potential toxicity and environmental impact. This underscores the importance of studying its properties thoroughly to ensure safe handling and use.

Fascinatingly, one quote from an esteemed chemist states, "The vibrancy of an azo compound often masks its complexities, challenging us to explore their potential both in application and in understanding." With ongoing research, the applications of this compound continue to evolve, revealing new opportunities and insights in various scientific disciplines.

Synonyms
1-(4'-nitrophenylazo)-2-hydroxy-6-sulfonaphthalene
CHEMBL2008559
NCI60_004060