By H.E. Avery
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Additional info for Basic Reaction Kinetics and Mechanisms
2 is obeyed. 3. 3 First-order plot for the hydrolysis of methyl acetate in excess dilute HCl at 25°C (ii} Gas chromatography In the last twenty years, the development of gas chromatographic techniques has facilitated the study of the kinetics of many gas-phase reactions. This analytical technique is extremely sensitive and can be used to analyse a large number of chemical compounds simultaneously. With gas-solid chromatography or gas-liquid chromatography it is possible to analyse the products of a very complex reaction and identify the minor as well as the major reaction products.
As A gets closer to BC, electronic interaction occurs and the potential energy increases. This increase continues until the configuration A-B-C is formed such that either AB +Cor BC +A is obtained. This intermediate configuration is the activated complex for this process represented by A + BC -* A-B-C -* AB + C When atom C separates to give molecule AB (or if the reaction merely reverses, to the original A + BC) the potential energy decreases again. The activated state is therefore the position of maximum potential energy along the reaction path.
2 Plot of log 10 (initial rate) against log 10 (initial concentration) reaction (2), the liberated iodine is detected with the starch indicator by the appearance of a blue colour. t to the appearance of this blue colour is measured. t, and [S 20l-lo and [I-] 0 are the initial reactant concentrations of the persulphate and iodide ions, respectively. [S 20 8 2 l is kept to less than 1 per cent of [S 20 8 2-] 0 , that is the rate is measured for 1 per cent of reaction. t against [r] with [S 2 0 8 2 -] 0 constant, since both these plots are linear.