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Asian Journal of Pharmaceutical Analysis
Year : 2018, Volume : 8, Issue : 1
First page : ( 20) Last page : ( 24)
Print ISSN : 2231-5667. Online ISSN : 2231-5675.
Article DOI : 10.5958/2231-5675.2018.00004.2

Comparative Study of Kinetics of Saponification of Ethyl Acetate by pH Method and Titration Method

Hadkar Ulhas Balkrishna1,*, Hadkar Asavari Sameer2,**

1Director/Professor, Mumbai Educational Trust Institute of Pharmacy, Bandra (West), Mumbai-400050

2Research Assistant, Mumbai Educational Trust Institute of Pharmacy, Bandra (West), Mumbai-400050

*Corresponding Author E-mail: ulhashadkar@yahoo.com

**asavarihadkar@gmail.com

Online published on 2 June, 2018.

Abstract

The hydrolysis of ethyl acetate in presence of NaOH has been studied by pH method and by titration method. In the pH method the pH of the reaction mixture was recorded at various time intervals and the data was used to calculate the specific reaction rate constant of the reaction at room temperature (28°C). In the pH method, “alkaline error” correction was used to get the “true pH” of the reaction mixture and was used to calculate the specific reaction rate constant. In the titration method excess acetic acid was used to arrest the reaction. The pH method gave more reliable value of specific reaction rate constant of saponification of ethyl acetate than the titration method.

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Keywords

Saponification, Specific reaction rate constant, pH method, titration method, alkaline error, glass combination pH electrode.

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