Metyylioranssin

Metyylioranssin, also known as methyl orange, is a pH indicator commonly used in chemistry and biology. It is a water-soluble azo dye that changes color depending on the acidity or basicity of the solution it is added to. The dye is typically orange-red in acidic solutions and yellow in basic solutions. The transition from orange-red to yellow occurs over a pH range of 3.1 to 4.4, making it useful for titrations and other acid-base reactions.

Methyl orange is a derivative of aniline, with the chemical formula C14H14N3O3S. It is synthesized by diazotizing aniline and coupling the resulting diazonium salt with β-naphthol. The dye is widely used in laboratories due to its simplicity and effectiveness. However, it is not suitable for use in biological samples because it can interfere with biological processes.

Methyl orange is also used in the textile industry for dyeing and printing fabrics. It is known for its vibrant colors and good fastness properties. In the food industry, it is used as a color additive, particularly in beverages and candies, under the E number E127. It is important to note that while methyl orange is generally considered safe for consumption, it should be used in accordance with food safety regulations.

In summary, methyl orange is a versatile pH indicator and dye with applications in chemistry, biology, textiles, and food industries. Its ability to change color based on pH makes it a valuable tool in various scientific and industrial processes.