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 ?
The pH indicator was injected into the EPF through a catheter in the window that was then sealed with parafilm.
He said the equipment contained in the boxes were magnifying glasses, spring balance, pendulums, PH indicator and test tubes.
Methyl orange is water soluble azo dye used as pH indicator and also has many applications in industries.
Ruminal fluid analysis revealed dark brown colour, pH measured with the help of pH indicator paper was acidic ranging between 4-5 and protozoal activity was nil on microscopic examination.
The swab was used to collect the microbial sample in the cervical margin of gingiva before FPD cementation and were cultured for different bacteria and salivary PH was estimated using PH indicator strip.
The carbon dioxide produced diffuses into a pH indicator reagent inside the inner tube forming carbonic acid which changes the pH and the color of the indicator solution.
To evaluate pH effect on seed germination, different concentration of MS medium were made by adding different volumes (75, 200 and 375 uL) of 50 mM CysNO solution to 25 mL of autoclaved MS and pH was checked with pH indicator paper (Advantec, UNIV) before the medium solidified.
Carbohydrate fermentation was tested on MRS supplemented with bromocresol purple as a pH indicator using the following sugars to differentiate the subspecies of Leuconostocs: Arabinose, Glucose, galactose, lactose, fructose, sucrose, sorbitol, mannitol, maltose Rhamnose, Raffinose, xylose [25, 26].
Caption: Figure 1: Locations for soil pH measurements in Victoria using a soil pH indicator test kit.
Sulfonephthalein pH indicator dyes have historically been noted for impurities originating from the synthesis process, which lead to batch to batch differences in pH measurements [1].
These immobilised algae balls are then standard units of photosynthesis and can be used in conjunction with a pH indicator to measure rates of photosynthesis.