Skip to main content

Congo Red

ADVERTISEMENT
Identification
Molecular formula
C32H22N6Na2O6S2
CAS number
573-58-0
IUPAC name
disodium;7-hydroxy-8-[(4-sulfonato-1-naphthyl)azo]naphthalene-1-sulfonate
State
State

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

Melting point (Celsius)
360.00
Melting point (Kelvin)
633.00
Boiling point (Celsius)
0.00
Boiling point (Kelvin)
0.00
General information
Molecular weight
696.67g/mol
Molar mass
696.6650g/mol
Density
0.7000g/cm3
Appearence

Congo Red appears as a dark red to brown powder. When dissolved in water, it yields a red solution. It is known for its ability to change color from blue-violet to red as the pH increases above 3.0. This compound is also used as a pH indicator and a histological stain for amyloidosis.

Comment on solubility

Solubility of Disodium 7-Hydroxy-8-[(4-Sulfonato-1-Naphthyl)Azo]Naphthalene-1-Sulfonate

Disodium 7-hydroxy-8-[(4-sulfonato-1-naphthyl)azo]naphthalene-1-sulfonate, often referred to for its vibrant color and utility in various applications, exhibits notable solubility characteristics:

  • Water Solubility: This compound is highly soluble in water due to its ionic nature from the sulfonate groups, making it an excellent choice for aqueous applications.
  • Solvent Interaction: It tends to interact well with polar solvents, which aids in its dissolution.
  • Temperature Effects: Increased temperature generally enhances its solubility, allowing for more efficient preparation of solutions.
  • pH Dependence: The solubility can be influenced by the pH of the solution, as some ionic compounds have varying solubilities in acidic versus basic environments.

In summary, the solubility of this compound can be underscored by its capacity to dissolve readily in water, influenced by factors such as temperature and pH. As a polymeric dye with sulfonated centers, it is ideal for applications that require stable solutions in aqueous environments.

Interesting facts

Interesting Facts about Disodium 7-Hydroxy-8-[(4-sulfonato-1-naphthyl)azo]naphthalene-1-sulfonate

This intriguing compound, often referred to as a diazo dye, is renowned for its vibrant coloring capabilities. Here are some notable aspects:

  • Dye Application: This compound is primarily used in the textile industry for dyeing, providing brilliant yellow hues to fabrics.
  • Biological Significance: Its structure allows it to interact with biological systems, making it a candidate for use in biochemical assays.
  • Environmental Impact: As with many azo dyes, there are concerns regarding its environmental footprint, especially regarding the potential for harmful byproducts in industrial wastewater.
  • Analytical Uses: The compound is also utilized in analytical chemistry as a reagent, often assisting in colorimetric detection methods.
  • Solubility Properties: The sulfonate groups enhance its water solubility, facilitating its use in aqueous solutions for various applications.

The fascinating structure of this compound showcases how functional groups can significantly modify chemical properties and applications. As observed, the presence of both hydroxyl and sulfonate groups plays a critical role in its ability to dissolve in water, making it exceptionally useful in diverse fields.

Overall, the versatility and vibrant color of disodium 7-hydroxy-8-[(4-sulfonato-1-naphthyl)azo]naphthalene-1-sulfonate not only highlight the beauty of chemical synthesis but also emphasize the importance of responsible usage and disposal in industrial practices. As one expert aptly put it, “Chemistry is the art of transformation,” and this compound embodies that very principle in its myriad applications.

Synonyms
ACID RED 25
Croceine 3BX
Kiton Red A
C.I. Acid Red 25
Croceine Scarlet 3BX
5858-93-5
Cyanine Fast Yellow R New
A8J861YF2V
CI 16050
CI Acid Red 25, disodium salt
HSDB 4224
PONCEAU 3RO
C.I. ACID RED 25 [HSDB]
C.I. 16050
1-Naphthalenesulfonic acid, 7-hydroxy-8-((4-sulfo-1-naphthalenyl)azo)-, disodium salt
1-NAPHTHALENESULFONIC ACID, 7-HYDROXY-8-(2-(4-SULFO-1-NAPHTHALENYL)DIAZENYL)-, SODIUM SALT (1:2)
1-Naphthalenesulfonic acid, 7-hydroxy-8-[2-(4-sulfo-1-naphthalenyl)diazenyl]-, sodium salt (1:2)
1Naphthalenesulfonic acid, 7hydroxy8((4sulfo1naphthalenyl)azo), disodium salt
611-714-2
disodium;7-hydroxy-8-[(4-sulfonatonaphthalen-1-yl)diazenyl]naphthalene-1-sulfonate
UNII-A8J861YF2V
DB-318328
Q27273772
7-Hydroxy-8-[(4-sulfo-1-naphthalenyl)azo]-1-naphthalenesulfonic acid disodium salt