acid-base indicators

All Sources -
Updated Media sources (1) About encyclopedia.com content Print Topic Share Topic
/reference/encyclopedias-almanacs-transcripts-and-maps/indicators-acid-base

Copyright The Columbia University Press

The Columbia Encyclopedia, 6th ed. The Columbia University Press

indicators, acid-base

acid-base indicators, organic compounds that, in aqueous solution, exhibit color changes indicative of the acidity or basicity of the solution. Common indicators include p-nitrophenol, which is colorless from pH 1 to 5 and yellow from pH 5 to 9; methyl orange, yellow in basic and neutral solutions and reddish below pH 3.7; phenolphthalein, colorless in acid and neutral solutions, pink at about pH 8.5, and purplish at pH 10; and litmus. Most indicators are also used in large amounts for dyeing; small quantities are nonetheless invaluable for use as indicators in chemical laboratories.

Columbia
/reference/encyclopedias-almanacs-transcripts-and-maps/acid-base-indicators

Copyright The Columbia University Press

The Columbia Encyclopedia, 6th ed. The Columbia University Press

acid-base indicators

acid-base indicators: see indicators, acid-base.

Columbia