Indicators

Indicators for Titration and Other Applications

We offer a large portfolio of high-quality indicators for observing chemical reactions. Our products available in various packaging sizes allow you to get all the indicators for your specific applications from a single source. Our indicators will enable you to accurately determine the endpoint for a wide range of titration types.

Our portfolio includes:

• Acid-alkali (pH) indicators
• Complex or metal indicators
• Fluorescence indicators
• Redox indicators

Also, we offer special indicators customized for the exact requirements of your applications. All our indicators are rigorously tested to ensure accurate, reliable, and reproducible results.

Acid-alkali (pH) indicators

An acid-alkali indicator or pH indicator is a weak-acid or weak-base that shows a color change as the concentration of hydrogen (H⁺) or hydroxide (OH^-) ions changes in an aqueous solution. The pH indicators are mainly used in laboratory applications to identify the endpoint of an acid-base reaction and quantitatively determine the acid or alkali content of a solution. When used as a rapid end-point indicator in an acid-base titration, the indicator undergoes a color change at the equivalence point, allowing the user to visually recognize the endpoint of the titration.

Complex or metal indicators

Complex or metal indicators are organic materials that undergo a definite color change on complexing with specific metal ions.

They are used in the volumetric analytical determination of the concentration of metal ions, such as determination of water hardness.

Fluorescence indicators

Fluorescence indicators are compounds that show a change in their fluorescent properties as a result of a change in the hydrogen-ion concentration, oxidation potential, or metal-ion concentration. Fluorescence indicators are essential to the end-point determination of precipitation titration, in which a well-defined change in one of these properties occurs at the equivalence point.

They can also be used to stain and visualize cells, cell components, chromosomes, and bacteria, as well as to detect antigen-antibody reactions.

Redox indicators

Redox indicators are compounds that show a color change at specific values of potential difference. These indicators have reduced and oxidized forms in different colors. Redox indicators are used in laboratories to track redox reactions, to determine approximate redox potentials, and to indicate the endpoint of a redox titration (in oximetry). The color of redox indicators does not change at a particular pH value, but instead at a specific redox potential, found closer to the equivalence point of the reaction.