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Congo Red

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Identification
Molecular formula
C32H22N6Na4O14S4
CAS number
573-58-0
IUPAC name
tetrasodium;3-hydroxy-4-[2-sulfonato-5-(4-sulfonatophenyl)azo-phenyl]azo-naphthalene-2,7-disulfonate
State
State

At room temperature, Congo Red is typically found as a solid. It is primarily known as a disodium salt, which gives it a crystalline form that is highly soluble in water, facilitating its practical applications as a biological stain and pH indicator.

Melting point (Celsius)
358.00
Melting point (Kelvin)
631.15
Boiling point (Celsius)
320.00
Boiling point (Kelvin)
593.15
General information
Molecular weight
696.67g/mol
Molar mass
696.6630g/mol
Density
0.9485g/cm3
Appearence

Congo Red typically appears as a brownish-red powder. It presents a distinctive color change when dissolved in water, where it can transition from blue to red depending on the acidity or alkalinity of the solution. This property makes it useful as a pH indicator.

Comment on solubility

Solubility of Tetrasodium 3-Hydroxy-4-[2-sulfonato-5-(4-sulfonatophenyl)azo-phenyl]azo-naphthalene-2,7-disulfonate

Tetrasodium 3-hydroxy-4-[2-sulfonato-5-(4-sulfonatophenyl)azo-phenyl]azo-naphthalene-2,7-disulfonate is a complex organic compound featuring multiple sulfonate groups. The presence of these highly polar functional groups plays a crucial role in its solubility characteristics.

Key Points on Solubility:

  • Hydrophilicity: Due to the numerous sulfonate (-SO3) groups, this compound exhibits a strong affinity for water, making it highly soluble in aqueous solutions.
  • Electrolytic Behavior: As it is a tetrasodium salt, it dissociates in water, leading to the formation of sodium ions and the corresponding anionic form, which enhances its solubility.
  • Temperature Effects: The solubility may improve further with increased temperature, as is common with many ionic compounds, allowing for better ionization and interaction with water molecules.
  • pH Sensitivity: The solubility can be influenced by the pH of the solution, as acidic or basic conditions may lead to changes in the ionic state of the compound.

In conclusion, the solubility of tetrasodium 3-hydroxy-4-[2-sulfonato-5-(4-sulfonatophenyl)azo-phenyl]azo-naphthalene-2,7-disulfonate in aqueous environments makes it particularly valuable in various applications such as dyes, inks, and pharmaceuticals. Its high solubility underscores its utility in formulations that require effective mixing and dispersion.

Interesting facts

Interesting Facts About Tetrasodium; 3-Hydroxy-4-[2-Sulfonato-5-(4-Sulfonatophenyl)Azo-Phenyl]Azo-Naphthalene-2,7-Disulfonate

Tetrasodium; 3-hydroxy-4-[2-sulfonato-5-(4-sulfonatophenyl)azo-phenyl]azo-naphthalene-2,7-disulfonate is a fascinating compound primarily known as a dye and a crucial component in various applications. Here are some interesting facts:

  • Versatile Dye: This compound belongs to the azo dye family, characterized by the presence of the azo group (-N=N-). Azo dyes are widely used in textiles, inks, and food coloring due to their vibrant colors.
  • Environmental Impact: One of the critical challenges with azo dyes is their biodegradability. Researchers are actively working to develop methods to break down these dyes in a sustainable manner, highlighting the balance between industrial use and environmental responsibility.
  • Pharmaceutical Applications: Due to its distinct chemical structure, this compound is being explored for potential uses in drug delivery systems and bioimaging, thanks to its ability to absorb light and fluoresce.
  • Reactive Groups: The presence of multiple sulfonate groups in this compound enhances its solubility in water, making it a highly effective dyeing agent while also paving the way for its applications in other aqueous systems.
  • Color Variations: Azo compounds are known for their range of colors, which can be altered by modifying their molecular structure. This tunability allows chemists to design dyes for specific applications, catering to different aesthetic and functional requirements.

"The art of chemistry lies not just in synthesizing compounds but also in understanding their potential and limitations."

In conclusion, tetrasodium; 3-hydroxy-4-[2-sulfonato-5-(4-sulfonatophenyl)azo-phenyl]azo-naphthalene-2,7-disulfonate captivates both scientists and industry professionals alike, as they explore its wide-ranging applications and unlock the potential for innovation.

Synonyms
LZYGEJPERQQCIY-STNZDNLRSA-J
D88455
Q2103492
tetrasodium 3-hydroxy-4-(2-{2-sulfonato-5-[2-(4-sulfonatophenyl)diazen-1-yl]phenyl}diazen-1-yl)naphthalene-2,7-disulfonate