phenolphthalein


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Related to phenolphthalein: methyl orange

phenolphthalein

 [fe″nol-thal´ēn]
a cathartic and pH indicator.

phe·nol·phthal·e·in

(fē'nol-thal'ē-in, -thal'ēn),
A hydrogen ion indicator obtained by the action of phenol on phthalic anhydride; formerly used as a laxative.

phenolphthalein

(fē′nōl-thăl′ēn′, -thăl′ē-ĭn, -thā′lēn′, -thā′lē-ĭn)
n.
A white or pale yellow crystalline powder, C20H14O4, used as an acid-base indicator, in making dyes, and formerly in medicine as an over-the-counter laxative.
References in periodicals archive ?
After 7, 28, and 72 days, the carbonation depth had been measured by spraying the phenolphthalein solution on the fractured surface.
Dye adsorption studies of p-nitrophenol and phenolphthalein were used to determine the accessible surface area (SA) and surface accessibility of the hydroxyl groups of cellulose and its cross-linked forms.
0.1% phenolphthalein was used as a visual indicator to detect the completion of neutralization.
To overcome this problem, in this work, we propose the use of pulsed plasma in liquid to produce pure, uncovered ZVI nanoparticles and use them in the degradation of phenolphthalein, which is widely used as an acidic-basic indicator, and because of its intense color at low concentrations, it is a suitable model molecule to easily follow its degradation.
Louis, MO, USA); ethyl ether was from Merck KGaA (Darmstadt, Germany); phenolphthalein, potassium iodide, and starch were from Carlo Erba reagents (Milan, Italy); sodium thiosulfate and potassium hydroxide were supplied by Titol Chimica (Rovigo, Italy).
Other examples of substances of particular public interest about which NTP provided critical research findings include AZT (azidothymidine) and a number of drug combinations used to prevent mother-to-child transmission of HIV (human immunodeficiency virus); fluoride; polychlorinated biphenyls; hexavalent chromium; acrylamide; silicone fluid used in breast implants; and phenolphthalein, which was once used in laxatives.
Benign causes of red-brown urine include intake of foods (beetroot, blackberries) and medication (rifampicin, phenolphthalein, and phenothiazines).
For the estimation of acid value, 10 mL of ethanol and 10 mL of hexane were 0.01N KOH using phenolphthalein indicator till the appearance of faint pink colour.
Enzyme activity was stopped by adding 1 ml of acetic acid and added phenolphthalein indicator 2-3 drops in the mixture.
Two corrosion-sensing coating formulations are reported in this section: one that contains phenolphthalein, a pH indicator which indicates corrosion with a visible color change, and a second that contains a corrosion indicator, which is a pH corrosion indicator through fluorescent changes, fluorescein.
Juice samples were titrated against 0.1 N NaOH using two to three drops of phenolphthalein as an indicator, and the results were expressed in percentage.
Liberated fatty acids were titrated with 0.1N NaOH using phenolphthalein as an indicator (Kempka et al., 2008).