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acid-base indicator
(redirected from PH indicator)

   Also found in: Medical, Encyclopedia, Wikipedia 0.01 sec.
acid-base indicator
n.
A substance that indicates the degree of acidity or basicity of a solution through characteristic color changes.

acid-base indicator
A substance, such as litmus paper, that indicates the degree of acidity or basicity of a solution through characteristic color changes.
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.acid-base indicator - an indicator that changes color on going from acidic to basic solutionsacid-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


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Scientists use something called pH indicator to measure how acid or alkali something is.
Staphylococcus: These vials contain the membrane filter and selective and differential growth medium above containing mannitol and a pH indicator (Phenol Red).
The Tufts team embedded three very different biological agents in the silk solution: a protein (hemoglobin), an enzyme (horseradish peroxidase) and an organic pH indicator (phenol red), which maintained their activity for long periods when simply stored on a shelf.
 
 
 
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