Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Indicators for Acids and Bases

Published

Author(s)

Thomas J. Bruno, Paris D. Svoronos

Abstract

The following table lists the most common indicators together with their pH range and colors in acidic and basic media. Since the color change is not instantaneous at the pKa value, a pH range is given where a combination of colors is present. This pH range, which varies between indicators, generally falls between the pKa with a spread or uncertainty of 1 pH unit. All solutions are either aqueous or ethanol/aqueous (% ethanol, vol/vol) [1-4]. Reference 4 provides additional solution properties that are related to buffer and solvent properties, and reference 5 lists the exact quantities needed for the indicator’s solutions.
Citation
CRC Handbook of Chemistry and Physics - 93rd edition
Publisher Info
CRC Taylor Francis, Boca Raton, FL

Citation

Bruno, T. and Svoronos, P. (2012), Indicators for Acids and Bases, CRC Taylor Francis, Boca Raton, FL (Accessed October 31, 2024)

Issues

If you have any questions about this publication or are having problems accessing it, please contact reflib@nist.gov.

Created June 22, 2012, Updated February 19, 2017