| 单词 | methyl orange |
| 释义 | > as lemmasmethyl orange methyl orange n. an orange crystalline dye that is the sodium salt of the azo compound of dimethylaniline and sulphanilic acid and is chiefly used as an acid–base indicator, changing from red to yellow-orange over a pH range of 3.1 to 4.4; (CH3)2NC6H4N=NC6H4SO3Na. ΘΚΠ the world > matter > chemistry > chemical tests > indicators > [noun] > pH indicators > acid or base indicators methyl orange1881 neutral red1890 methyl red1910 1881 G. Lunge in Chem. News 16 Dec. 288/1 It is in reality a salt of sulpho-benzene-azo-dimethylamin, for which long name I propose the short and sufficiently clear name ‘Methyl-orange’. 1910 Jrnl. Chem. Soc. 97 2490 Methyl-orange cannot be used when conc. H· is greater than 10−5. 1930 S. Field & A. D. Weill Electro-plating 56 The ordinary indicators used by the chemist such as litmus, methyl orange and phenolphthalein. 1969 H. A. Flaschka et al. Quantitative Analyt. Chem. II. ix. 110 Methyl orange is therefore unsuited to the titration of a weak acid. 1989 R. Dryer & G. Lata Exper. Biochem. ii. i. 341 Many dyes are noncovalently bound to proteins. Methyl orange, phenolphthalin..are examples. < as lemmas |
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