This material is used as a pH indicator due to its distinct color change between red and yellow from ranges of pH 3.1 to 4.4. Identification Product Name Methyl Orange Cat No. : M216-25, M216-500 CAS-No 547-58-0 Synonyms Acid Orange 52; C.I SAFETY DATA SHEET Creation Date 24-Nov-2010 Revision Date 17-Jan-2018 Revision Number 3 1. Formula Weight 301 - 400 (1) Available for Sale USA Globally Search term: "Methyl Orange solution" Compare Products: Select up to 4 products. Synonym: 4-[4-(Dimethylamino)phenylazo]benzenesulfonic acid sodium salt, Acid Orange 52, Empirical Formula (Hill Notation): C 14 H 14 N 3 NaO 3 S Molecular Weight: 327.33 Methyl orange has the property to color alkaline and neutral water yellow. The correct formula of methyl orange is,C14H14N3NaO3S. Methyl orange Last updated Save as PDF Page ID 81657 From Wikipedia Other names Main ChemSpider page Molecular formula: C 14 H 14 N 3 NaO 3 S Molar mass: 327.334 CAS Registry Number: 547-58-0 Melting point: Not Methyl Orange measures from a pH of 3.1(color red) to 4.4(color yellow) This neutralizes it to carbon dioxide, water and salt. If the solution is yellow, hydrochloric acid at a concentration of 0.1 Methyl orange should be destroyed with a strong oxidizer, such as piranha solution, Fenton's reagent or chromic acid. The point of change is at pH 4.3. Methyl orange's molecular formula is written as C14H14N2NaO3S. Excess oxidizer is then neutralized and checked for any If the water becomes acidic, it turns red immediately.