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Congo Red

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Identification
Molecular formula
C32H22ClN6Na2O6S2
CAS number
573-58-0
IUPAC name
disodium;6-(5-chloro-2-hydroxy-3-sulfonato-phenyl)azo-5-hydroxy-naphthalene-1-sulfonate
State
State

Congo Red is typically in a solid state at room temperature. It is commonly available as a powder and is soluble in water, where it imparts a striking red color due to its dye properties.

Melting point (Celsius)
360.00
Melting point (Kelvin)
633.00
Boiling point (Celsius)
0.00
Boiling point (Kelvin)
0.00
General information
Molecular weight
696.66g/mol
Molar mass
696.6640g/mol
Density
0.9968g/cm3
Appearence

Congo Red appears as a brownish-red or dark red powder. It is a synthetic azo dye, notable for its bright and vibrant color, which is used in dyeing textile fabrics and as an indicator in chemical experiments. It has strong color fastness and can appear bright red when dissolved in water.

Comment on solubility

Solubility of Disodium 6-(5-Chloro-2-hydroxy-3-sulfonato-phenyl)azo-5-hydroxy-naphthalene-1-sulfonate

The compound disodium 6-(5-chloro-2-hydroxy-3-sulfonato-phenyl)azo-5-hydroxy-naphthalene-1-sulfonate is known for its solubility characteristics that are influenced by its complex molecular structure. Understanding its solubility can give insights into its applications and behavior in various environments.

Key Solubility Features:

  • Water Solubility: This compound is highly soluble in water, making it suitable for aqueous applications.
  • Influence of pH: The solubility can vary significantly with changes in pH, as the sulfonate groups are highly ionic, enhancing solubility in alkaline conditions.
  • Effect of Temperature: Increasing temperature usually enhances solubility further, a common trait among sulfonated compounds.
  • Electrolytic Nature: As a disodium salt, it is more soluble due to the dissociation into ions, which promotes interaction with water molecules.

In summary, the solubility of disodium 6-(5-chloro-2-hydroxy-3-sulfonato-phenyl)azo-5-hydroxy-naphthalene-1-sulfonate makes it a versatile compound in chemical applications, especially when a high degree of aqueous compatibility is required. However, factors such as pH and temperature must be carefully controlled to maintain optimal solubility levels. As stated in the words of chemists: "Solubility is the gateway through which chemical reactions occur."

Interesting facts

Interesting Facts about Disodium 6-(5-Chloro-2-hydroxy-3-sulfonato-phenyl)azo-5-hydroxy-naphthalene-1-sulfonate

Disodium 6-(5-chloro-2-hydroxy-3-sulfonato-phenyl)azo-5-hydroxy-naphthalene-1-sulfonate, commonly known as an azo dye, presents a fascinating study in the field of chemical compounds. Here are some compelling points to consider:

  • Azo Dyes: This compound belongs to the vast family of azo dyes, characterized by the presence of a nitrogen-nitrogen (N=N) double bond. These dyes are widely used in various industries due to their vibrant colors and stability.
  • Applications: Disodium 6-(5-chloro-2-hydroxy-3-sulfonato-phenyl)azo-5-hydroxy-naphthalene-1-sulfonate is particularly useful in the textile industry, where it imparts bright colors to fabrics. It may also find applications in food and cosmetics due to its coloring properties.
  • Environmental Impact: The synthetic processes involved in creating azo dyes have raised concerns about their environmental effects and potential toxicity. As a result, ongoing research focuses on developing safer, more sustainable alternatives.
  • Analytical Chemistry: Azo dyes, including this compound, play important roles in analytical chemistry. They can be used as pH indicators or in spectrophotometry due to their distinct absorption characteristics.
  • Research Platforms: The structure and properties of this compound are often studied to gain insights into the behavior of azo compounds in biological systems, leading to advances in understanding metabolic pathways and potential health effects.

In summary, disodium 6-(5-chloro-2-hydroxy-3-sulfonato-phenyl)azo-5-hydroxy-naphthalene-1-sulfonate is more than just a chemical compound; it reflects the intersection of beauty, application, environmental responsibility, and scientific inquiry. As with many azo dyes, it serves as a vivid reminder of the need for innovation in both chemistry and industry.

Synonyms
EINECS 222-828-3
1-Naphthalenesulfonic acid, 6-((5-chloro-2-hydroxy-3-sulfophenyl)azo)-5-hydroxy-, disodium salt
1-Naphthalenesulfonic acid, 6-(2-(5-chloro-2-hydroxy-3-sulfophenyl)diazenyl)-5-hydroxy-, sodium salt (1:2)
1-Naphthalenesulfonic acid, 6-[(5-chloro-2-hydroxy-3-sulfophenyl)azo]-5-hydroxy-, disodium salt
1-Naphthalenesulfonic acid, 6-[2-(5-chloro-2-hydroxy-3-sulfophenyl)diazenyl]-5-hydroxy-, sodium salt (1:2)
1-Naphthalenesulfonic acid, 6-(5-chloro-2-hydroxy-3-sulfophenyl)azo-5-hydroxy-, disodium salt
C.I. MORDANT BLUE 9, DISODIUM SALT
disodium;6-[(5-chloro-2-hydroxy-3-sulfonatophenyl)diazenyl]-5-hydroxynaphthalene-1-sulfonate
6-(5-Chloro-2-hydroxy-4-sulfophenylazo)-5-hydroxy-1-naphthalenesulfonic acid disodium salt
SCHEMBL590710
SCHEMBL2859111
DTXSID5063104
Mordant Blue 9, Dye content 50 %
AKOS024319592
Sodium 6-(5-chloro-2-hydroxy-4-sulphophenylazo)-5-hydroxynaphthalene-1-sulphonate