A crystalline solid, C20H14O4, which is the simplest phthalein and is used in alcoholic solution as an indicator in the pH range 8 (colourless) to 10…
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| 释义 | the world > matter > chemistry > chemical tests > indicators > [noun] > pH indicators (7) phenolphthalein1875 A crystalline solid, C20H14O4, which is the simplest phthalein and is used in alcoholic solution as an indicator in the pH range 8 (colourless) to 10… phenolsulphonphthalein1898 = phenol red n. at phenol, n. compounds 2. phenol red1916 a red crystalline solid, C19H14O5S, which is used as a pH indicator in the range 6.7 (yellow) to 8.3 (red), and in medicine is given intravenously… nitramine1922 spec. An aromatic compound of this class, (CH3)(NO2)NC6H2(NO2)3, used as a pH indicator and in explosives. Subcategories:— acid or base indicators (3) |
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