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Phenolphthalein (/ f ɛ ˈ n ɒ l (f) θ ə l iː n / [citation needed] feh-NOL(F)-thə-leen) is a chemical compound with the formula C 20 H 14 O 4 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.
In organic chemistry, phenols, sometimes called phenolics, are a class of chemical compounds consisting of one or more hydroxyl groups (−O H) bonded directly to an aromatic hydrocarbon group. [1] The simplest is phenol, C 6 H 5 OH. Phenolic compounds are classified as simple phenols or polyphenols based on the number of phenol units in the ...
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.
Number of carbon atoms Basic skeleton Number of phenolic cycles Class Examples 6 C 6: 1 Simple phenols, Benzoquinones: Catechol, Hydroquinone, 2,6-Dimethoxybenzoquinone 7 C 6-C 1: 1 Phenolic acids, Phenolic aldehydes: Gallic, salicylic acids 8 C 6-C 2: 1 Acetophenones, Tyrosine derivatives, Phenylacetic acids
Indicators can also show change in other physical properties; for example, olfactory indicators show change in their odor. The pH value of a neutral solution is 7.0 at 25°C (standard laboratory conditions). Solutions with a pH value below 7.0 are considered acidic and solutions with pH value above 7.0 are basic.
If angel number 1212 continually shows up, Kumaar recommends keeping a few points in mind (and potentially acting on them). For starters, embrace and stay open to new opportunities. Approach these ...
Phenol red exists as a red crystal that is stable in air. Its solubility is 0.77 grams per liter (g/L) in water and 2.9 g/L in ethanol. [1] It is a weak acid with pK a = 8.00 at 20 °C (68 °F).
The envelope showed Routh’s name, prison ID number and return address at the prison. The letter was also signed by Routh’s daughter, Sara Routh, 31, an electrician living in Hawaii.