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1.用氣泡最大压力法测定了三乙胺、正戊胺、正己胺、正庚胺、正辛胺、異戊胺、二異戊胺和三異戊胺,以及胺及其盐的不同浓度的水溶液在20°时的表面张力。對於胺溶液在极稀浓度时的不正常表面张力变化情形予以解释。 2.觀测了三異戊胺盐酸盐和正已胺硫酸盐水溶液在不同浓度時和不同测定时间的表面张力,并作了可能的解释。 3.根據表面张力-浓度曲线,计算出三乙胺、正戊胺、正己胺、正辛胺、異戊胺及二異戊胺在溶液饱和吸附时每一分子所佔的平均面積。结果说明了各胺在饱和吸附时,分子在表面作垂直的定向排列,而在氮原子上有分枝的胺,则可能有枝鏈互相交叉的排列情形。 4.本文说明脂肪胺可以作酸鹼滴定指示剂,而以二異戊胺最为合適。此类指示剂还用到金属盐溶液的滴定。
1. Determination of different concentrations of triethylamine, n-pentylamine, n-hexylamine, n-heptylamine, n-octylamine, isoamylamine, diisopentylamine and triisopentylamine, as well as amines and their salts by the maximum bubble pressure method Of the surface tension of the aqueous solution at 20 °. The case of abnormal surface tension changes in amine solutions at very dilute concentrations is explained. The surface tension of triisopentanamine hydrochloride and n-hexamine sulfate aqueous solution at different concentrations and different measuring time were observed and possible explanations were made. 3. According to the surface tension-concentration curve, calculate the average area of each molecule of triethylamine, n-pentylamine, n-hexylamine, n-octylamine, isoamylamine and diisoamylamine in the solution saturated adsorption. The results show that the molecules in the saturation adsorption, the molecules in the vertical alignment of the surface, while the nitrogen atoms on the branches of the amine, there may be branches of the cross-array arrangement. 4. This article shows that fatty amines can be used as acid-base titration indicator, and the most suitable is diisopropylamine. Such indicators also use metal salt solution titration.