ABSTRACT

Indicators are the chemical agents which aid in determining the equivalence point in acid– base titrations.They are normally weak acids and bases that show significant change in colour as the pH of the solution changes. Today's acid-base indicators are synthetic in nature, but because of pollution caused by them, availability, and expense, the quest for natural compounds as an acid-base indicator began. The aim of this study was to find environmental friendly natural indicators for neutralization titrations. The indicator properties of Tectona grandis Linn. leaves extract was tested for acid-base titrations. The end point colours and average titre values obtained, when used in different types of acid-base titration, were nearly identical to those obtained with standard indicators except weak acid and weak base titration of specific molar strength. The results refer to a new way of enriching laboratory practical’s with natural indicators that is useful, economic and environment friendly. Keywords: Acid-base titration, Indicator, Leaf extract, Phenolphthalein and Tectona grandis
Publication date: 01/03/2022

https://ijbpas.com/pdf/2022/March/MS_IJBPAS_2022_5970.pdf

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https://doi.org/10.31032/IJBPAS/2022/11.3.5970