Methyl orange is a synthetic dye commonly used as a pH indicator in titrations. It changes color from red to yellow as the pH of a solution increases, specifically transitioning around a pH of 3.1 to 4.4. This property makes it useful in determining the acidity or alkalinity of various solutions. In addition to its role in chemistry, methyl orange is also employed in the textile and food industries for coloring purposes. However, it is important to note that methyl orange is not suitable for use in biological applications due to its potential toxicity.