Overview
Sodium Diphenylamine-4-sulfonate is a specialized chemical compound widely recognized for its role as a redox indicator in analytical chemistry. Its ability to change color in response to oxidation-reduction reactions makes it invaluable in titrations, particularly for detecting endpoints in the presence of metals like iron. The compound is synthesized through sulfonation of diphenylamine, resulting in a water-soluble sodium salt that is easy to handle and store under standard laboratory conditions. Its significance in quantitative analysis stems from its sharp color transition, which enhances the accuracy of titration results. The compound's stability and solubility in water further contribute to its widespread adoption in laboratories and industrial settings where precise chemical measurements are critical.
Physical and Chemical Properties
Sodium Diphenylamine-4-sulfonate appears as a white to light yellow crystalline powder, with a molecular weight of 271.27 g/mol. It is highly soluble in water, which facilitates its use in aqueous solutions for titration purposes. The compound's solubility in ethanol is limited, making water the preferred solvent for most applications. As a redox indicator, Sodium Diphenylamine-4-sulfonate exhibits a distinct color change from colorless to violet in the presence of oxidizing agents, particularly in acidic media. This property is leveraged in the detection of iron and other transition metals, where it serves as a reliable endpoint indicator. The compound's sensitivity to pH and redox potential underscores its utility in diverse analytical procedures.
Main Applications
The primary application of Sodium Diphenylamine-4-sulfonate is in redox titrations, where it acts as an indicator to signal the completion of a reaction. It is especially useful in the determination of iron content in samples, a common requirement in environmental testing, metallurgy, and pharmaceutical quality control. Beyond titrations, the compound finds use in educational laboratories for teaching redox chemistry principles. Its clear and reproducible color changes make it an excellent tool for demonstrating oxidation-reduction reactions to students. Industrial applications also include its use in the synthesis of other sulfonated compounds, where it serves as an intermediate in more complex chemical processes.
Safety and Storage
Sodium Diphenylamine-4-sulfonate should be handled with care to avoid exposure. Protective equipment such as gloves, goggles, and lab coats are recommended to prevent skin and eye contact. Inhalation of dust should be avoided by working in a well-ventilated area or using a fume hood. Storage conditions are critical to maintaining the compound's stability. It should be kept in a tightly sealed container, away from light and moisture, in a cool and dry environment. Prolonged exposure to heat or humidity can degrade the compound, reducing its effectiveness as an indicator. Proper labeling and segregation from incompatible substances are also essential to prevent accidental misuse.
B2B Procurement Guide
When procuring Sodium Diphenylamine-4-sulfonate, B2B buyers should prioritize suppliers who provide detailed product specifications and a Certificate of Analysis (CoA). This ensures the compound meets the required purity standards for its intended applications. Bulk purchases may offer cost advantages, but buyers should verify storage capabilities to maintain product integrity. Quality control is paramount, especially for applications in sensitive industries like pharmaceuticals. Buyers should establish long-term relationships with reputable suppliers to ensure consistent quality and reliable delivery schedules. Additionally, understanding regional regulatory requirements for chemical procurement can streamline the purchasing process and avoid compliance issues.
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