| 单词 | phenolphthalein |
| 释义 | phenolphthalein noun[U] chemistryspecializeduk/ˌfiː.nɒlˈfθæl.iːn/us/ˌfiː.noʊlˈθæl.iːn/asubstancethat iscolourlesswhen it ismixedwith anacidandpinkorredwhenmixedwith analkali 酚酞Chemicals, chemical compounds & gases
phenolphthalein| American Dictionaryphenolphthalein noun[U] us/ˌfi·nəlˈθeɪ·li·ən,-ˈθeɪ·lin,-ˈθæl·i·ən,-ˈθæl·in/science asubstancethat iscolorlesswhen it ismixedwith anacidandpinkorredwhenmixedwith analkali Examplesofphenolphthaleinphenolphthalein Stimulants, especiallyphenolphthaleinand castor oil, can cause dehydration and electrolyte disturbances in the elderly patient. From theCambridge English Corpus This is, in fact, sold under a variety of names, some of which are antikamnia, ammonol, antitoxin, phenalgin, andphenolphthalein. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under theOpen Parliament Licence v3.0 Phenolphthaleinis insoluble in water and usually is dissolved in alcohols for use in experiments. From Wikipedia  This example is from Wikipedia and may be reused under a CC BY-SA license.Several indicators share a similar structure to phenol red, including bromothymol blue, thymol blue, bromocresol purple, thymolphthalein, andphenolphthalein. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.It is closely related to bisacodyl, sodium picosulfate, andphenolphthalein. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.The acid-base indication abilities ofphenolphthaleinalso make it useful for testing for signs of carbonation reactions in concrete. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.This is typically achieved by boiling an alkaline solution ofphenolphthaleinwith powdered zinc, which reduces thephenolphthaleininto phenolphthalin. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.Phenolphthaleinis used in a test to identify substances that are thought to be, or to contain, blood. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.Developer fluids may be applied using a spray bottle, but some developers are in the form of vaporous, e.g. ammonia fumes used to developphenolphthaleinink. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.Phenolphthalein's past use for its laxative properties has been discontinued due to concerns it may be carcinogenic. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.In several sources, the structure of phenol red is shown with the sulfur atom being part of a cyclic group, similar to the structure ofphenolphthalein. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.A universal indicator is typically composed of water, propan-1-ol,phenolphthaleinsodium salt, sodium hydroxide, methyl red, bromothymol blue monosodium salt, and thymol blue monosodium salt. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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