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acid-base indicator

Wikipedia English The Free Encyclopedia

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PH indicator
A pH indicator is a halochromic chemical compound  added in small amounts to a solution so the pH (acidity or basicity) of the solution can be determined visually. Hence, a pH indicator is a chemical detector for hydronium ions (H3O+) or hydrogen ions (H+) in the Arrhenius model. Normally, the indicator causes the color of the solution to change depending on the pH. Indicators can also show change in other physical properties; for example, olfactory indicators show change in their odor. The pH value of a neutral solution is 7.0. Solutions with a pH value below 7.0 are considered acidic and solutions with pH value above 7.0 are basic (alkaline). As most naturally occurring organic compounds are weak protolytes, carboxylic acids and amines, pH indicators find many applications in biology and analytical chemistry. Moreover, pH indicators form one of the three main types of indicator compounds used in chemical analysis. For the quantitative analysis of metal cations, the use of complexometric indicators is preferred, whereas the third compound class, the redox indicators, are used in titrations involving a redox reaction as the basis of the analysis.

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WordNet 2.0 Dictionary

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acid-base indicator

1. an indicator that changes color on going from acidic to basic solutions
(hypernym) indicator
(hyponym) phenolphthalein

General Chemistry Glossary

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acid-base indicator
A weak acid that has acid and base forms with sharply different colors. Changes in pH around the acid's pKa are "indicated" by color changes.

Glosarium Pusat Bahasa Depdiknas Indonesia

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acid-base indicator
B: (Kimia) indikator asam-basa

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