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Congo Red

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Identification
Molecular formula
C10H9NO4S
CAS number
92-44-4
IUPAC name
4-amino-5-hydroxy-naphthalene-1-sulfonic acid
State
State

At room temperature, Congo Red is found in a solid state, usually as a powder. The substance is stable under normal conditions, displaying its red color prominently in its solid form as well as when dissolved in a solvent within its stability range.

Melting point (Celsius)
0.00
Melting point (Kelvin)
273.15
Boiling point (Celsius)
385.00
Boiling point (Kelvin)
658.15
General information
Molecular weight
291.32g/mol
Molar mass
291.3200g/mol
Density
0.7988g/cm3
Appearence

Congo Red is typically a red to dark brown powder that is known for its ability to dye cotton directly. It has a strikingly brilliant red color when used as a stain and is often used in the textile industry. In solution, it maintains its red color within certain pH ranges, vividly illustrating its use as a pH indicator.

Comment on solubility

Solubility of 4-amino-5-hydroxy-naphthalene-1-sulfonic acid

4-amino-5-hydroxy-naphthalene-1-sulfonic acid, often referred to as H Acid, exhibits notable solubility characteristics that make it a subject of interest in various chemical applications. This compound is known for its ability to dissolve in water, which is beneficial for its use as a dye and for other chemical processes.

Key Solubility Insights:

  • Water Solubility: It is soluble in water due to the presence of multiple polar functional groups, such as the amino (-NH2) and hydroxyl (-OH) groups, which enhance its interaction with water molecules.
  • Organic Solvents: Solubility in organic solvents may be limited compared to its solubility in water. It may not dissolve well in non-polar solvents due to its polar characteristics.
  • pH Dependence: The solubility can be affected by the pH of the solution, as ionic forms may enhance solubility in more alkaline or acidic environments.

In summary, the solubility of 4-amino-5-hydroxy-naphthalene-1-sulfonic acid is significantly influenced by its chemical structure, making it highly soluble in aqueous solutions while limiting its solubility in non-polar organic solvents. This property is crucial for its effective use in dye production and other chemical applications.

Interesting facts

Interesting Facts About 4-Amino-5-Hydroxy-Naphthalene-1-Sulfonic Acid

4-Amino-5-hydroxy-naphthalene-1-sulfonic acid, often abbreviated as >4-Amino-5-Hydroxy-Naphthalene Sulfonic Acid, is a notable compound in the realm of organic chemistry, particularly due to its unique structural properties and applications. Here are some intriguing aspects of this compound:

  • Versatile Applications: This compound is commonly used in the manufacture of azo dyes and pigments, primarily due to its ability to act as a coupling agent. It enhances color stability, making it essential in textile and ink industries.
  • Biological Significance: While its primary uses are industrial, studies have suggested potential biological roles. Some investigations indicate it may have properties that affect cellular processes, though further research is needed.
  • Environmental Considerations: As with many sulfonic acids, its presence in industrial waste can raise concerns. The compound falls under scrutiny for its possible environmental impact, making disposal and regulation important topics in discussions about sustainability.
  • Historical Context: The synthesis of compounds like 4-amino-5-hydroxy-naphthalene-1-sulfonic acid showcases the historical evolution of dye chemistry. The development of such compounds has paved the way for modern synthetic dyes.

In the words of a fascinating chemist, "Every compound tells a story, and the narrative of 4-amino-5-hydroxy-naphthalene-1-sulfonic acid is one of versatility, creativity, and caution in the grand scheme of chemical applications." This reflects not only its significance in laboratories but also its implications in industrial practices and environmental stewardship.

As we continue to explore the applications and properties of such compounds, one must remember the balance between innovation and responsibility in the chemical sciences.

Synonyms
83-64-7
1-Amino-8-naphthol-4-sulfonic acid
4-amino-5-hydroxynaphthalene-1-sulfonic acid
S acid
1-NAPHTHALENESULFONIC ACID, 4-AMINO-5-HYDROXY-
4-Amino-5-hydroxy-1-naphthalenesulfonic acid
Chicago acid S
Kyselina S
Kyselina S [Czech]
Aminonaphtholsulfonic acid S
Aminonaphthol sulfonic acid S
EINECS 201-491-6
8-Amino-1-naphthol-5-sulfonic acid
NSC 10434
Kyselina 1-amino-8-naftol-4-sulfonova
BRN 2127506
AI3-23217
4-Amino-5-hydroxynaphthalene-1-sulphonic acid
Kyselina 1-amino-8-naftol-4-sulfonova [Czech]
DTXSID1058896
3-14-00-02290 (Beilstein Handbook Reference)
1-Amino-8-naphthol-4-sulfonic Acid (>80%)
4-amino-5-hydroxy-naphthalene-1-sulfonic acid
WLN: L66J BSWQ EZ GQ
4-AMINO-5-HYDROXY-1-NAPHTHALENE SULFONIC ACID
S-Saure
3-?[[[3-?(Aminomethyl)?-?5-?methyl-?1-?oxohexyl]?amino]?methyl]?-?5-?methyl-hexanoic Acid
MFCD00003992
Kinome_2995
CBMicro_015320
CBMicro_015560
8Amino1naphthol5sulfonic acid
SCHEMBL156516
CHEMBL1618860
DTXCID6048335
Kyselina 1amino8naftol4sulfonova
LRDIEHDJWYRVPT-UHFFFAOYSA-
NSC7555
AAA08364
NSC-7555
NSC10434
NSC-10434
NSC178276
4-NH2-5-OH-naphthalenesulfonic acid
AKOS015854949
NSC-178276
4Amino5hydroxynaphthalene1sulphonic acid
1Naphthalenesulfonic acid, 4amino5hydroxy
DB-056730
A0369
CS-0251728
NS00038267
1-amino-8-hydroxynaphthalene-4-sulphonic acid
D88254
EN300-5589243
201-491-6
InChI=1/C10H9NO4S/c11-7-4-5-9(16(13,14)15)6-2-1-3-8(12)10(6)7/h1-5,12H,11H2,(H,13,14,15)