acid-base indicator

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Related to PH indicator: PH meter
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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
References in periodicals archive ?
2], which will change the pH of the disc, which changes the color of the pH indicator in the disc.
The approved devices, designed to provide safer nasogastric (NG) tube placement and accurate gastric acidity measurement using an innovative in vitro pH indicator include, RightSpot pH Indicator, RightSpot Infant pH Indicator and RightLevel pH Detector.
The urine dipstick test for protein uses a pH indicator and is not affected.
This pH-dependent change in color (and visible light absorbance), likened to a pH indicator dye, may have different effects in different assays.
calidolactis and pH indicator in solid medium, than cups were incubated at 64 [+ or -] 1[degrees]C for 3 h.
Once in your consulting room, test the pH of the inferior fornix with lithmus paper or the pH indicator on a urine dipstix.
The principle of operation is to trap an oxygen-sensitive fluorophore or pH indicator dye in a sol-gel host matrix that can be applied to the tip of a fibre, an adhesive membrane such as a patch or a flat substrate such as a cuvette.
However, during the gelation pH of the mix decreases below 8 and the pH indicator does not show any color change at this pH.
Litmus is still the most universal pH indicator, which can be used for measurements on scale from pH=2.
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.