acid-base indicator

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Noun

acid-base indicator - an indicator that changes color on going from acidic to basic solutions

phenolphthalein - a laxative used in many preparations under various trade names; also used as an acid-base indicator in titrations involving weak acids and strong bases because it is brilliant red at high alkalinity and colorless below pH 8

congo red - a red-brown azo dye especially as a chemical pH indicator (congo red is red in basic and blue in acidic solutions)

methyl orange - an azo dye used as an acid-base indicator; used for titrations involving weak bases

indicator - (chemistry) a substance that changes color to indicate the presence of some ion or substance; can be used to indicate the completion of a chemical reaction or (in medicine) to test for a particular reaction

litmus, litmus test - a coloring material (obtained from lichens) that turns red in acid solutions and blue in alkaline solutions; used as a very rough acid-base indicator

bromophenol blue, bromphenol blue, tetrabromo-phenolsulfonephthalein - a dye used as an acid-base indicator

bromothymol blue, bromthymol blue - a dye used as an acid-base indicator

References in periodicals archive ?

The vodcast/vidcast "Acid-base indicator" describes an experiment using the phenolphthalein (Figure 9), his aim was to encourage questioning, explain and reflect.

Podcasts in the Chemistry Teaching

It is an acid-base indicator whose useful range lies between pH 3.0 and 4.6.

Gel Electrophoresis and alternative tracking dye

One strategy involves using an acid-base indicator such as thymolphthalein, which has a deep blue color in an alkaline solution but is colorless in acidic conditions.