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Congo Red

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Identification
Molecular formula
C32H22N6Na2O6S2
CAS number
573-58-0
IUPAC name
disodium;3-hydroxy-4-phenylazo-naphthalene-2,7-disulfonate
State
State

At room temperature, Congo Red is commonly found in solid state as a powder.

Melting point (Celsius)
360.00
Melting point (Kelvin)
633.15
Boiling point (Celsius)
0.00
Boiling point (Kelvin)
0.00
General information
Molecular weight
696.67g/mol
Molar mass
696.6650g/mol
Density
0.8300g/cm3
Appearence

Congo Red appears as a red-brown crystalline powder or solid that readily dissolves in water, providing a red solution.

Comment on solubility

Solubility of Disodium 3-Hydroxy-4-phenylazo-naphthalene-2,7-disulfonate

Disodium 3-hydroxy-4-phenylazo-naphthalene-2,7-disulfonate is a fascinating compound, particularly due to its solubility characteristics. Solubility is a crucial property that influences the behavior and applications of this compound in various fields. Here are some noteworthy points regarding its solubility:

  • Aqueous Solubility: This compound is highly soluble in water, which is indicative of its ionic nature stemming from the two sulfonate functional groups present in its structure. The presence of these sulfonate groups enhances its interaction with water molecules.
  • Temperature Dependence: The solubility may increase with temperature due to enhanced molecular motion, allowing for better solute-solvent interactions.
  • Effect of pH: The solubility might also be influenced by the pH of the solution, as changes in pH can affect the ionization of the sulfonate groups, potentially altering solubility.
  • Compatibility: It is generally compatible with other polar solvents but may exhibit decreased solubility in non-polar solvents, limiting its versatility in various applications.

In conclusion, the overall solubility of disodium 3-hydroxy-4-phenylazo-naphthalene-2,7-disulfonate can be summarized as considerably high when in aqueous environments, showcasing its utility in numerous chemical processes and applications. Fluidity in solubility under varying conditions makes it an interesting compound to study.

Interesting facts

Interesting Facts about Disodium 3-Hydroxy-4-Phenylazo-Naphthalene-2,7-Disulfonate

Disodium 3-hydroxy-4-phenylazo-naphthalene-2,7-disulfonate is an intriguing compound that belongs to the class of azo dyes. It is primarily known for its vibrant coloring properties and has a variety of applications in the fields of chemistry and industry.

Key Features:

  • Azo Dyes: As a member of the azo dye family, this compound contains the azo group (-N=N-), which is responsible for its intense colors. Azo dyes are widely used in textiles, food, and cosmetics.
  • Structural Complexity: The naphthalene core combined with the sulfonic acid groups enhances solubility in water, making it suitable for various applications. This structural feature allows the dye to be easily applied in aqueous solutions.
  • pH Sensitivity: The sulfonate groups help the compound exhibit different behaviors in varying pH levels, which can lead to changes in color and intensity. This property adds to its utility in pH indicators and colorimetric analyses.

Applications:

  • Textile Industry: It is commonly used as a dye for fabrics, providing vibrant and long-lasting colors.
  • Biochemical Research: The compound may serve as a marker in biochemical assays, lending its distinctive color to visualize reactions.
  • Food Industry: An important aspect of azo dyes like this one is their use in food coloring, although it is crucial to ensure that they meet safety regulations.

As with many azo compounds, it is important to consider the safety and environmental impact of their use. Some azo dyes can decompose into potentially harmful amines, so ongoing research and regulation play a vital role in the industry.

In summary, disodium 3-hydroxy-4-phenylazo-naphthalene-2,7-disulfonate stands as a significant compound in both academic and industrial contexts, showcasing the fascinating intersection of chemistry and practical application. Its vibrant color, structural complexity, and wide array of uses make it a compound worthy of discussion and exploration in the field of chemical science.

Synonyms
2,7-Naphthalenedisulfonic acid, 3-hydroxy-4-(2-phenyldiazenyl)-, sodium salt (1:2)
5859-00-7
2,7-Naphthalenedisulfonic acid, 3-hydroxy-4-(phenylazo)-, disodium salt
Naphthalene Lake Orange R
Cetil Orange RR
Acid Orange R
Colacid Orange R
Acid Ponceau 2G
Kiton Ponceau 2G
Croceine Orange 2R
Brilliant Orange 2R
Kayaku Acid Orange G
Tertracid Orange P2G
C.I. Acid Orange 14
disodium;3-hydroxy-4-phenyldiazenylnaphthalene-2,7-disulfonate
C.I. 16100
C.I. ACID ORANGE 14, DISODIUM SALT
EINECS 227-502-4
NSC 45548
DTXSID5064041
Disodium 3-hydroxy-4-(phenylazo)naphthalene-2,7-disulphonate
AKOS000283040
NS00046012
2,5-Naphthalenedisulfonic acid, 3-hydroxy-4-(phenylazo)-, disodium salt