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.
Dregs
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The 'dregs' is the usually known as the beer at the bottom of a can or bottle. Often tastes more watery/less frothy than the rest of the beer.
Dregs meaning & definition 1 of Dregs.
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Although it most commonly refers to the beer at the tail-end of a beer, it can also refer to someones leftovers, or sloppy seconds. This also applies to sexual sloppy-seconds by which it refers to someone that the subject has already had sexual intercourse with.
Dregs meaning & definition 2 of Dregs.
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- A rare, unique slang meaning the worst part(s) or dirty/grimey.
- [Fuck].
The words original origin comes from wine brewers. Dregs or lees were the words applied to the wine residue during the aging process. Dregs also comes from the grammatical base of the word dark.
Dregs meaning & definition 3 of Dregs.
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Leftover dense material. Used to describe industrial [sludge]. Another informal usage refers to the last few centimetres of coffee at the bottom of the pot.
Dregs meaning & definition 4 of Dregs.
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The reusable residue left after cooking an opiate for the purpose of injection.
Dregs meaning & definition 5 of Dregs.
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Somtimes referred to as a hangover, or many days not taking a bath and you look like skidrow, or a bad hair day.
Dregs meaning & definition 6 of Dregs.
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The remnants of a liquid left in a container, together with any sediment.
Dregs meaning & definition 7 of Dregs.
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the small solid pieces that sink to the bottom of some liquids, such as wine or coffee, that are not usually drunk:
Dregs meaning & definition 8 of Dregs.