| 词汇 | phenolphthalein |
| 释义 | phenolphthalein noun[ U ] chemistry specializeduk /ˌfiː.nɒlˈfθæl.iːn/ us /ˌfiː.noʊlˈθæl.iːn/ a substance that is colourless when it is mixed with an acid and pink or red when mixed with an alkali酚酞 Chemicals, chemical compounds & gases acetic acid acetone acrolein acrylamide activated charcoal adenine agglomerate ethyl alcohol glyphosate H2O HCFC HFC hyaluronic acid hydrochloric acid laughing gas limescale metho meths oxyacetylene tartaric acid phenolphthalein | American Dictionaryphenolphthalein noun[ U ] us/ˌfi·nəlˈθeɪ·li·ən, -ˈθeɪ·lin, -ˈθæl·i·ən, -ˈθæl·in/ science a substance that is colorless when it is mixed with an acid and pink or red when mixed with an alkali Examples of phenolphthaleinphenolphthalein Stimulants, especially phenolphthalein and castor oil, can cause dehydration and electrolyte disturbances in the elderly patient. This is, in fact, sold under a variety of names, some of which are antikamnia, ammonol, antitoxin, phenalgin, and phenolphthalein. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 Phenolphthalein is 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, and phenolphthalein. 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, and phenolphthalein. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The acid-base indication abilities of phenolphthalein also 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 of phenolphthalein with powdered zinc, which reduces the phenolphthalein into phenolphthalin. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Phenolphthalein is 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 develop phenolphthalein ink. 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 of phenolphthalein. 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, phenolphthalein sodium 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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