An indicator is a weak acid that ionizes within a known pH range, usually about 2 pH units. We can represent the protonated form of the indicator molecule as HIn and the deprotonated form as In−. ... In the case of
What is an indicator in an experiment?
Chemical indicator, any substance that gives a visible sign, usually by a colour change, of the presence or absence of a threshold concentration of a chemical species, such as an acid or an alkali in a solution. An example is the substance called methyl yellow, which imparts a yellow colour to an alkaline solution.
What color is the protonated form of the indicator for methyl orange?
Question: Methyl orange is an indicator used for detecting the pH of acidic solutions. The red, protonated form of the indicator (HID) dissociates into a yellow, deprotonated form (In) as shown in the reaction. The pK, for methyl orange is 3.4.
