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Orange G

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Identification
Molecular formula
C16H10N2Na2O7S2
CAS number
1936-15-8
IUPAC name
4,5-dihydroxy-3-phenylazo-naphthalene-2,7-disulfonic acid
State
State

At room temperature, Orange G is typically found in a solid state as a powder, often stored in dry conditions to maintain its stability and prevent decomposition or loss of effectiveness as a dye.

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
452.3760g/mol
Density
1.5086g/cm3
Appearence

Orange G is a synthetic dye, typically appearing as an orange or yellowish-orange powder or granules. It is often supplied as a sodium salt to enhance solubility in water.

Comment on solubility

Solubility of 4,5-Dihydroxy-3-phenylazo-naphthalene-2,7-disulfonic Acid

The solubility of 4,5-dihydroxy-3-phenylazo-naphthalene-2,7-disulfonic acid can be quite fascinating due to its unique molecular structure. This compound, featuring multiple functional groups, exhibits varying solubility characteristics depending on the solvent used.

Key Influencing Factors:

  • Hydrophilicity: The presence of sulfonic acid groups increases the hydrophilicity of this compound, resulting in enhanced solubility in polar solvents like water.
  • pH Sensitivity: The solubility can also be influenced by the pH of the solution, as the ionization of the sulfonic groups will vary, affecting its overall behavior in solution.
  • Temperature: Like many organic compounds, solubility generally increases with temperature, making heating a practical approach to dissolve this acid in a solvent.

To summarize, while 4,5-dihydroxy-3-phenylazo-naphthalene-2,7-disulfonic acid demonstrates a relatively high solubility in polar solvents, factors such as temperature and pH can significantly impact its dissolution properties. Understanding these aspects is crucial for applications in chemical processes and formulations.

Interesting facts

Interesting Facts about 4,5-Dihydroxy-3-phenylazo-naphthalene-2,7-disulfonic Acid

4,5-Dihydroxy-3-phenylazo-naphthalene-2,7-disulfonic acid is a fascinating compound with a range of applications, particularly in the field of chemistry and dye technology. Here are some captivating points to consider:

  • Coloring Agent: This compound is known for its vibrant azo dye properties. Azo dyes are characterized by the presence of one or more azo groups (-N=N-) and are widely used in textiles, foods, and cosmetics to impart color.
  • Fluorescence: 4,5-Dihydroxy-3-phenylazo-naphthalene-2,7-disulfonic acid exhibits fluorescence under ultraviolet light, making it useful in various analytical chemistry applications, including fluorescence microscopy.
  • Acidity: Due to the presence of sulfonic acid groups, this compound is highly acidic. The sulfonate groups enhance its solubility in water, allowing it to be easily utilized in various reactions and preparations.
  • Environmental Impact: Azo dyes can raise environmental concerns due to their potential to release harmful amines upon degradation. Research is ongoing to explore safer alternatives and remediation strategies to address these issues.
  • Analytical Chemistry: It serves as a valuable reagent in the field of analytical chemistry for the determination of various metal ions, offering a reliable method for qualitative and quantitative analysis.

In the realm of chemistry, compounds like 4,5-dihydroxy-3-phenylazo-naphthalene-2,7-disulfonic acid exemplify the complexity and utility of chemical structures. The elegant balance of its functional groups not only gives the compound its unique properties but also facilitates a variety of applications across different scientific fields. As stated by chemists, “The beauty of chemistry lies in understanding how diverse elements can combine to produce such intriguing compounds.”

Synonyms
13432-13-8
4,5-dihydroxy-3-(phenyldiazenyl)naphthalene-2,7-disulfonic acid
4,5-dihydroxy-3-phenyldiazenylnaphthalene-2,7-disulfonic acid
SCHEMBL5351115
acid red 29 (free acid form)
SCHEMBL22798905
CHEBI:87108
Q27159373
2,7-Naphthalenedisulfonic acid, 4,5-dihydroxy-3-phenylazo-
4,5-Dihydroxy-3-phenylazo-2,7-naphthalenedisulfonic acid
1,8-di-hydroxy-2-(phenylazo)-3,6-naphthalene disulphonic acid
4,5-dihydroxy-3-[(E)-phenylazo]naphthalene-2,7-disulfonic acid