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Phenolphthalein is slightly soluble in water and usually is dissolved in alcohols in experiments. It is a weak acid, which can lose H + ions in solution. The nonionized phenolphthalein molecule is colorless and the double deprotonated phenolphthalein ion is fuchsia. Further proton loss in higher pH occurs slowly and leads to a colorless form.
Chemical structure of phenolphthalein, a common phthalein dye. Phthalein dyes are a class of dyes mainly used as pH indicators, due to their ability to change colors depending on pH. [1] They are formed by the reaction of phthalic anhydride with various phenols. They are a subclass of triarylmethane dyes. Common phthalein dyes include ...
Phthalic anhydride is the organic compound with the formula C 6 H 4 (CO) 2 O. It is the anhydride of phthalic acid.Phthalic anhydride is a principal commercial form of phthalic acid.
This is a property of pH indicators, whose molecular structure changes upon certain changes in the surrounding pH. This change in structure affects a chromophore in the pH indicator molecule. For example, phenolphthalein is a pH indicator whose structure changes as pH changes as shown in the following table:
The following other wikis use this file: Usage on be.wikipedia.org Фенолфталеін; Usage on cs.wikipedia.org Ftalid; Usage on da.wikipedia.org
The following other wikis use this file: Usage on af.wikipedia.org Fenolftaleïen; Usage on ar.wikipedia.org أنهيدريد الفثاليك; Usage on az.wikipedia.org
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The oxides exhibit basic character: they turn phenolphthalein red and litmus, blue. They react with water to form hydroxides in an exothermic reaction. CaO + H 2 O → Ca(OH) 2 + Q. Calcium oxide reacts with carbon to form acetylide. CaO + 3C → CaC 2 + CO (at 2500°C) CaC 2 + N 2 → CaCN 2 + C CaCN 2 + H 2 SO 4 → CaSO 4 + H 2 N—CN