分光光度法测定 25 °C 水中苦味酸的热力学 pK 值。

Journal of research of the National Bureau of Standards. Section A, Physics and chemistry Pub Date : 1963-05-01 Epub Date: 1963-06-01 DOI:10.6028/jres.067A.024

Marion Maclean Davis, Maya Paabo

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引用次数: 0

摘要

苦味酸的热力学 pK 值是在含有盐酸的水中用分光光度法测定的，盐酸可以抑制离子化。根据 450 mμ 下的数据得出 pK 值为 0.33（K ≈ 0.46）。试图通过苦味酸的电位滴定法和苦味酸溶液在近饱和范围内的分光光度法来确定 pK 值的结果并不令人满意。新的 pK 值与之前公布的值进行了比较。

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Spectrophotometric Determination of the Thermodynamic pK Value of Picric Acid in Water at 25 °C.

The thermodynamic pK value of picric acid was determined spectrophotometrically in water containing hydrochloric acid to repress the ionization. The pK value 0.33 (K ≈ 0.46) was obtained from data at 450 mμ. Attempts to determine the pK value by potentiometric titrations of picric acid and by spectrophotometric measurements of picric acid solutions in the near-saturation range did not yield satisfactory results. The new pK value is compared with previously published values.

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Journal of research of the National Bureau of Standards. Section A, Physics and chemistry

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