分光光度法研究可逆反应动力学过程

doi:10.3866/PKU.DXHX202008028

Abstract

Abstract:

Kinetics is an important part of physical chemistry laboratory teaching. In this article, we present a spectrophotometric method for study of the reversible kinetic reaction process of phenolphthalein-NaOH system. The ambient temperature has little influence on the experimental reaction, and the spectrophotometer is the only required instrument for carrying out this experiment. All reagents used are in small amount and low toxic, which is in accordance with the green chemistry concept.

Key words: Spectrophotometric method, Reversible reaction, Dynamics, Sodium hydroxide, Phenolphthalein

Xizhe Huang, Zengjun Liao, Xinyi He, Rongtian Xu, Dongmei Han. Spectrophotometric Method for Kinetics of Reversible Reaction[J].University Chemistry, 2021, 36(2): 2008028.

序号	酚酞乙醇溶液加入量/mL	酚酞浓度/(mmol?L^?1)	Origin中Exponential拟合曲线	R²
(1)	0.05	0.05	A_t = 0.3264 + 1.258exp(?0.040T)	0.9999
(2)	0.10	0.1	A_t = 0.6252 + 2.479exp(?0.039T)	0.9998
(3)	0.15	0.15	A_t = 0.7391 + 2.950exp(?0.037T)	0.9974
(4)	0.20	0.20	A_t = 1.139 + 2.922exp(?0.38T)	0.8523
(5)	0.25	0.25	曲线平滑度不佳，未作Exponential拟合
(6)	0.50	0.5	曲线平滑度不佳，未作Exponential拟合

序号	温度/℃	Origin中Exponential拟合曲线	R²	k/(L?mol^?1?s^?1)	k’/ms^?1	x_A∞/(μmol?L^?1)	x_B∞/(μmol?L^?1)
(1)	25	A_t = 0.6252 + 2.4791exp(?0.039T)	0.9998	0.623	7.85	20.14	79.86
(2)	30	A_t = 0.7130 + 2.400exp(?0.057T)	0.9997	0.879	13.1	22.90	77.10
(3)	35	A_t = 0.9470 + 2.443exp(?0.075T)	0.9993	1.08	21.0	27.94	72.06
(4)	40	A_t = 1.163 + 2.618exp(?0.105T)	0.9972	1.45	32.3	30.76	69.24

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Spectrophotometric Method for Kinetics of Reversible Reaction

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