| 单词 | methyl red |
| 释义 | > as lemmasmethyl red methyl red n. [ < methyl n. + red n., after German Methylrot (Rupp & Loose 1909, in Bericht der Deutsch. Chem. Ges. 41 3905)] a dark red, weakly acidic, water-insoluble dye that is the azo compound of dimethylaniline and anthranilic acid and is used (in alcoholic solution) as an acid–base indicator, changing from red to yellow over a pH range of 4.2 to 6.3; (CH3)2NC6H4N=NC6H4COOH. ΘΚΠ the world > matter > chemistry > chemical tests > indicators > [noun] > pH indicators > acid or base indicators methyl orange1881 neutral red1890 methyl red1910 1910 Jrnl. Chem. Soc. 97 2490 As a means of measuring colorimetrically the concentration of hydrogen ions in a solution, methyl-red would probably be found valuable when such concentration lies between 10−5 and 10−6. 1933 S. W. Cole Pract. Physiol. Chem. (ed. 9) xiv. 331 Wash down the exterior of D also, add a few drops of methyl-red..and titrate with the CO2-free soda. 1969 R. B. Fischer & D. G. Peters Brief Introd. Quantitative Chem. Anal. viii. 212 At pH 4·2 (and below)..methyl red is present as the red acid form and..it exists as the yellow base form if the pH becomes 6·2 (and above). 1982 G. C. Hill & J. S. Holman Chem. in Context: Lab. Man. & Study Guide 51/2 Each pair of students will need..Methyl red indicator (28 drops). < as lemmas |
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