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Congo Red

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Identification
Molecular formula
C32H22N6Na4O14S4
CAS number
573-58-0
IUPAC name
tetrasodium;7-hydroxy-8-[(4-sulfonato-1-naphthyl)azo]naphthalene-1,3,6-trisulfonate
State
State

Congo Red is generally found in a solid state at room temperature. It is typically in the form of powder or granules and is soluble in water.

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
0.8103g/cm3
Appearence

Congo Red appears as a dark red-brown to red-violet powder. It is often used as a dye and has a distinct color in solution, typically showing a red hue that shifts to blue in acidic conditions.

Comment on solubility

Solubility Characteristics

The compound tetrasodium;7-hydroxy-8-[(4-sulfonato-1-naphthyl)azo]naphthalene-1,3,6-trisulfonate, commonly known as a sulfonated azo dye, exhibits interesting solubility properties due to its ionic nature. Here are some key points to consider:

  • Solvent Dependence: This compound is highly soluble in polar solvents, particularly water, due to its multiple sulfonate groups.
  • Ionic Interaction: The presence of the tetrasodium cations enhances its solubility, allowing it to dissociate into constituent ions in aqueous solutions.
  • Environmental Conditions: Factors such as temperature and pH can significantly affect solubility. For instance, increasing temperature may lead to higher solubility rates.
  • Application in Solutions: The high solubility makes it suitable for various applications in chemical processes, dyeing industries, and analytical chemistry.

In summary, the solubility of this compound in water can be characterized as quite favorable, making it versatile for applications where conductive and coloring properties are required. The phrase, “Solubility opens the door to reactivity,” resonates well with this compound's properties.

Interesting facts

Interesting Facts About Tetrasodium 7-Hydroxy-8-[(4-sulfonato-1-naphthyl)azo]naphthalene-1,3,6-trisulfonate

Tetrasodium 7-hydroxy-8-[(4-sulfonato-1-naphthyl)azo]naphthalene-1,3,6-trisulfonate, often referred to simply as a dye, is part of a fascinating class of compounds known as azo dyes. These dyes are characterized by their vivid colors and are widely used in various industries. Here are some noteworthy aspects of this compound:

  • Applications: This compound is primarily used in textiles for dyeing fabrics, providing bright and long-lasting colors.
  • Chemical Structure: Its unique structure includes multiple sulfonate groups, which enhance its solubility in water, making it effective in various applications.
  • Environment Impact: Like many azo dyes, concerns have been raised regarding potential toxicological effects and environmental sustainability, necessitating responsible usage and disposal.
  • Color Fastness: Dyes of this type are valued for their ability to maintain color integrity even after exposure to conditions like washing or light.

One remarkable feature of azo dyes is their vibrant color spectrum, ranging from bright reds to deep blues. This versatility is due to the flexibility of the azo bond itself, which can be modified to create other derivatives with a range of hues.

As a future chemist, understanding the chemistry behind compounds like tetrasodium 7-hydroxy-8-[(4-sulfonato-1-naphthyl)azo]naphthalene-1,3,6-trisulfonate is crucial. The development and innovation in dye chemistry not only illustrate the beauty of chemical interactions but also highlight the need for ongoing research into environmentally friendly practices.

From the classroom to industry, the implications of such dyes extend beyond their appearance, raising questions about the intersection of chemistry, sustainability, and health. As we explore these compounds, let us remember that behind every chemical formula lies a story of discovery and application.

Synonyms
C.I. Acid Red 41
1,3,6-Naphthalenetrisulfonic acid, 7-hydroxy-8-((4-sulfo-1-naphthalenyl)azo)-, tetrasodium salt
1,3,6-Naphthalenetrisulfonic acid, 7-hydroxy-8-[(4-sulfo-1-naphthalenyl)azo]-, tetrasodium salt
Acid red 41
5850-44-2
Neklacid Red 6R
85283-68-7
Scarlet 6R
Ponceau 6RA
tetrasodium;7-hydroxy-8-[(4-sulfonatonaphthalen-1-yl)diazenyl]naphthalene-1,3,6-trisulfonate
Ponceau 6RPA
Ponceau Red 6R
Acilan Ponceau 6R
Eurocert Ponceau 6R
C.I. Food Red 8
L-Red 5
Hispacid Brilliant Scarlet
Ponceau 6R Specially Pure
Cerven kysela 41 [Czech]
Cerven kysela 41
Cerven potravinarska 8 [Czech]
Cerven potravinarska 8
PONCEAU6R
EINECS 227-454-4
C.I. Acid Red 41, tetrasodium salt
CI 16290
C.I. 16290
E 126
EINECS 286-597-0
SFUBBBHFRZPTIM-QNKYWQQSSA-J
DTXSID001021376
7-Hydroxy-8-((4-sulfo-1-naphthalenyl)azo)-1,3,6-naphthalenetrisulfonic acid, tetrasodium salt
7-Hydroxy-8-((4-sulpho-1-naphthyl)azo)naphthalene-1,3,6-trisulphonic acid, sodium salt
Tetrasodium 7-hydroxy-8-((4-sulphonato-1-naphthyl)azo)naphthalene-1,3,6-trisulphonate
NS00047732
7-Hydroxy-8-[(4-sulpho-1-naphthyl)azo]naphthalene-1,3,6-trisulphonic acid,sodium salt