Noun1.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 ...
acid–base indicator Phenolphthalein is another weak organic acid. It is not particularly water soluble, so we generally dissolve it in aqueous ethanol. The ethanol explains the pleasant, sweet smell of phenolphthalein solutions. Phenolphthalein is colourless and clear in acidic solutions, but imparts...
The molecule found its first use as a pH indicator as it’s colourless in acids but turns bright purple-pink in alkaline solutions. If you’ve ever done an acid base titration experiment or used pH indicators in research then it’s likely that phenolphthalein was involved. It’s also used...
phenolphthalein, (C20H14O4), an organic compound of the phthalein family that is widely employed as anacid-base indicator. As an indicator of a solution's pH, phenolphthalein is colourless below pH 8.5 and attains a pink to deep red hue above pH 9.0. How does phenolphthalein work as a...
(e)Phenolphthalein is an indicator and is represented by the formul a HIn.Phenolphthalein, HIn, is a weak acid.HInH++ In The K value for phenolphthalein is 5.0 × 10-10moldm-3 at 298 K. This indicator changes colour at a pH of approximately 8.8.[In-]Calculate the ratio n at pH ...
acid–base indicator Phenolphthalein is another weak organic acid. It is not particularly water soluble, so we generally dissolve it in aqueous ethanol. The ethanol explains the pleasant, sweet smell of phenolphthalein solutions.Phenolphthalein is colourless and clear in acidic solutions, but imparts ...
eg. titrating NaOH with HCl. Since both are strong acid/base, then the pH of neutralisation is 7. This means the indicator I use should exhibit a colour change when the pH of my solution is in the vincity of 7. Logged "Say you're in a [chemical] plant and there's a snake on ...
Besides lights and acid/base controllable colour change and fluorescence-changing, altering phase states could also tune their colours via different temperature, which is rare performance for diarylethene derivatives. Especially, the photocylization ratio is as high as 100% for compound 2o bearing two...
When phenolphthalein is used as the indicator in a titration of an HCl solution with a solution ofNaOH, the indicator undergoes a colour change from colourless to poink at the end point of the tiration. This colour change occurs abruptly because ...
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