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Congo Red

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Identification
Molecular formula
C32H22N6Na2O6S2
CAS number
573-58-0
IUPAC name
disodium;2-[(2-hydroxy-1-naphthyl)azo]-5-(4-sulfonatophenyl)azo-benzenesulfonate
State
State

At room temperature, Congo Red exists as a solid, specifically as a powder, commonly used in laboratories and industrial applications.

Melting point (Celsius)
360.00
Melting point (Kelvin)
633.00
Boiling point (Celsius)
500.00
Boiling point (Kelvin)
773.00
General information
Molecular weight
696.67g/mol
Molar mass
696.6650g/mol
Density
0.9307g/cm3
Appearence

Congo Red appears as a red-brown, fine powder. It imparts a characteristic deep red color to fabrics and solutions when used as an acid-base indicator or pH indicator. In strong acidic conditions, it turns blue, while in alkaline conditions it remains red.

Comment on solubility

Solubility of Disodium 2-[(2-hydroxy-1-naphthyl)azo]-5-(4-sulfonatophenyl)azo-benzenesulfonate

The compound disodium 2-[(2-hydroxy-1-naphthyl)azo]-5-(4-sulfonatophenyl)azo-benzenesulfonate, often referred to as a dye, exhibits notable solubility characteristics that are pertinent in various applications.

Key points regarding its solubility include:

  • Water Solubility: This compound is typically highly soluble in water. The presence of sulfonate groups (-SO₃Na) contributes significantly to its affinity for aqueous environments.
  • Solvent Dependence: While exhibiting excellent solubility in water, it may demonstrate varying degrees of solubility in organic solvents, often depending on the solvent polarity.
  • pH Influence: Solubility can also be affected by the pH of the solution. Under acidic or basic conditions, the solubility can change, leading to alterations in the compound's behavior and performance.
  • Temperature Effects: Increased temperature may enhance solubility, although specific temperature profiles must be evaluated to establish optimal conditions for applications.

This compound's solubility profile makes it an effective choice for applications in colorants, inks, and various industrial processes, where solubility plays a crucial role in performance and functionality. As one looks to utilize this compound, understanding these solubility attributes can help tailor its use for specific needs, ensuring desired outcomes in both practical and experimental settings.

Interesting facts

Interesting Facts about Disodium 2-[(2-hydroxy-1-naphthyl)azo]-5-(4-sulfonatophenyl)azo-benzenesulfonate

Disodium 2-[(2-hydroxy-1-naphthyl)azo]-5-(4-sulfonatophenyl)azo-benzenesulfonate, commonly referred to in the realm of dyes and pigments, is a fascinating compound with a legacy that spans across various fields. Here are some intriguing aspects of this chemical:

  • Industrial Uses: This compound is prevalent in the textile industry as a dye, especially in the coloration of textiles. Its vibrant hues come from the azo group, which is known for producing intense colors.
  • Complex Structure: The compound features a multi-functional structure that contains both naphthyl and sulfonate groups, making it a unique example of azo dye chemistry. This complex design contributes to its properties, enabling not just color but also interactions with various materials.
  • Environmental Considerations: Azo dyes, including this compound, have been scrutinized for their environmental impact. Some azo dyes can break down into aromatic amines, which can be hazardous. Hence, the safe disposal and handling of such dyes are critical in industrial settings.
  • Applications Beyond Textiles: Beyond textiles, azo dyes like disodium 2-[(2-hydroxy-1-naphthyl)azo]-5-(4-sulfonatophenyl)azo-benzenesulfonate find applications in food coloring, cosmetics, and even in some laboratory assays. This versatility is a prime reason for their enduring presence in various industries.
  • Historical Significance: Azo dyes have historical importance as they were among the first synthetic dyes developed in the 19th century. This progression marked a significant shift in how colors were produced, moving from natural to synthetic sources.

In conclusion, disodium 2-[(2-hydroxy-1-naphthyl)azo]-5-(4-sulfonatophenyl)azo-benzenesulfonate is not just another chemical compound; it symbolizes the intersection of chemistry with industry, environmental science, and history. As you delve deeper into its properties and implications, remember to consider both its colors and complexities!

Synonyms
Biebrich scarlet
4196-99-0
Acid Red 66
Ponceau BS
Biebrich Scarlet WS
Croceine scarlet
Acid Scarlet BA
Fast Scarlet BA
Fenazo Scarlet B
Scarlet 3B
C.I. Acid Red 66
Imperial Scarlet 3B
Imperial Scarlet 3BN
Calcochrome Red 650
Naphthazine Scarlet BI
Amacid Chrome Red 3B
Cloth Red G
Scarlet Red Sulfonate NF
Amacid Red 3B
Red HM
Biebrich Scarlet W 5
C.I. 26905
ponceau B
C.I. ACID RED 66, DISODIUM SALT
Sodium 6-(2-hydroxynaphthylazo)-3,4'-azodibenzenesulphonate
EINECS 224-084-5
NSC 79710
DTXSID2063345
CHEBI:87186
disodium 2-[(2-hydroxynaphthalen-1-yl)diazenyl]-5-[(4-sulfonatophenyl)diazenyl]benzene-1-sulfonate
disodium 2-((2-hydroxynaphthalen-1-yl)diazenyl)-5-((4-sulfonatophenyl)diazenyl)benzene-1-sulfonate
DTXCID9040003
C.I. Acid Red 66, disodium salt (8CI)
224-084-5
Biebrich scarlet sodium salt
ACIDRED66
Biebrich Scarlet (C.I. 26905)
MFCD00003891
Benzenesulfonic acid, 2-((2-hydroxy-1-naphthalenyl)azo)-5-((4-sulfophenyl)azo)-, disodium salt
ponceau-bs
starbld0009518
Benzenesulfonic acid, 2-(2-(2-hydroxy-1-naphthalenyl)diazenyl)-5-(2-(4-sulfophenyl)diazenyl)-, sodium salt (1:2)
SCHEMBL136632
SCHEMBL2855839
YCKMEQRBEVVZQF-VKZXTWAVSA-L
Acid red 66;C.I. 26905
AKOS004901559
AKOS024375432
FB40935
NS00048919
Q833649
disodium 2-[2-(2-hydroxynaphthalen-1-yl)diazen-1-yl]-5-[2-(4-sulfonatophenyl)diazen-1-yl]benzenesulfonate
disodium;2-[(2-hydroxynaphthalen-1-yl)diazenyl]-5-[(4-sulfonatophenyl)diazenyl]benzenesulfonate