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- W2000510844 abstract "The UV-visible spectra of o-methyl red were examined at 25°C in water at various acidities and the variations in the spectra were correlated with the structures of the several forms of the compound. The two acid-base equilibria that involve the monoprotonated form of o-methyl red were treated as overlapping equilibria. The thermodynamic acid dissociation constants (Ka2 and Ka3) of the diprotonated and the monoprotonated forms were found to be (4.16 ± 0.14) × 10−3 and (1.40 ± 0.02 ) × 10−5 mol dm−3, respectively. Complete extraction of o-methyl red from the aqueous phase into the CCl4 phase was observed in the pH range 1.25–5.6. The significance of this result with respect to the structure of the monoprotonated form is discussed." @default.
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- W2000510844 date "1991-01-01" @default.
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- W2000510844 title "A spectrophotometric study of the acid-base equilibria of o-methyl red in aqueous solutions" @default.
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- W2000510844 doi "https://doi.org/10.1016/0143-7208(91)80027-7" @default.
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