Cas No. 547-58-0 Molecular Weight: 327.33 Description: Methyl orange is a synthetic dye commonly used as a pH indicator in titrations, particularly in acid-base reactions. It is an azo dye, which means it contains a nitrogen-nitrogen double bond (–N=N–) linking aromatic rings. Here are some key characteristics of methyl orange: Chemical Structure: It’s a sodium salt of the azo compound. Color Change: Methyl orange changes color depending on the pH of the solution: In acidic solutions (pH < 3.4), it appears red. In alkaline solutions (pH > 4.4), it turns yellow. The color change occurs over the pH range of approximately 3.4 to 4.4, making it suitable for detecting weak acid/strong base and strong acid/weak base titrations. Uses: It is used in titrations to determine the endpoint of acid-base reactions. Also used as a dye in the textile industry and in various scientific applications. Safety: While methyl orange is not highly toxic, it can cause skin or eye irritation, and care should be taken when handling it. Specification: Color: Orange Form: Crystalline powder Loss on dryingmax. 5% Absorbance (A) of 1% solution (pH 4.4) in a 1cm cell @470nm750 – 850 pH range3.1 (Pink orange) to 4.4 (Yellow)
