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Citation: Zhang Ben-Li, Tan Chang-E, Gao Zhen-Heng. Specific Salt Effects on the Determination of Catalytic Constants of Hydrolysis[J]. Acta Physico-Chimica Sinica, ;1991, 7(01): 92-96. doi: 10.3866/PKU.WHXB19910115 shu

Specific Salt Effects on the Determination of Catalytic Constants of Hydrolysis

1.
Department of Chemistry, Nankai University, Tianjin

Received Date: 31 December 1988
Available Online: 15 February 1991

In order to investigate the influences of specific salt effect of added electrolyte on the classic buffer experiments for distinguishing general and specific acid or base catalysis, the rate constants of the hydrolysis of benzaldehyde di-ter-butyl acetal, triethyl orthobenzoate and N-p-methoxybenzyli-denepyrrolidinium ion in acetate buffers were measured under various conditions. It is found that, for a given reaction, the presence or absence of specific effect of an added salt depends mainly on the ionic stregth and solvent of the buffer solution. In buffers of low ionic strength, e.g. 0.1 mol·L~(-1), using water or mixed solvents containing a small fraction of organic constituent, specific salt effect can be eliminated or considerably reduced and the classic diagnostic buffer experiments can be satisfactory.
- Acid-base catalysis; Catalytic constants; Specific salt effect; Hydrolysis reaction
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