Phenolphthalein ( feh-NOL(F)-thə-leen) is a chemical compound with the formula C20H14O4 and is often written as HIn, HPh, phph or simply Ph in shorthand notation. Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colorless in acidic solutions and pink in basic solutions. It belongs to the class of dyes known as phthalein dyes.
Phenolphthalein is slightly soluble in water and usually is dissolved in alcohols for use 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 loss of proton in higher pH occurs slowly and leads to a colorless form. Phenolphthalein ion in concentrated sulfuric acid is orange red due to sulfonation.
Enmity
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The quality of being an enemy; hostile or unfriendly
disposition.
Enmity meaning & definition 1 of Enmity.
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A intense feeling of hatred and animosity; viewing the object of your hostility as being your sworn enemy for life.
Enmity meaning & definition 2 of Enmity.
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Deep-seated, often mutual hatred.
Enmity meaning & definition 3 of Enmity.
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The state or feeling of being actively opposed or hostile to someone or something.
Enmity meaning & definition 4 of Enmity.
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