A Novel, Inexpensive and Less Hazardous Acid-Base Indicator
نویسندگان
چکیده
A new acid -base indicator which is less hazardous and inexpensive is proposed. It is capable of d istinguishing between the acids and bases. Titrations were carried out to ensure that the proposed indicator yields quantitative results. The results of titrations were quite satisfactory. The indicator was giving a distinct sustained colour even in the case of weak base and weak acid titrations. Colour of standard indicators like phenolphthalein reappears in titrations even after reaching the end point, but this does not happen in the case of our indicator. Pyrogallol is the chemical which is being used to prepare the indicator solution. Historically, it was heavily used for various purposes like dying and photographic developments. The cost-benefit analysis shows that this indicator is inexpensive when compared with the available standard indicators. Certain indicators have the carcinogenic and flammability issues associated with them, while a study of the MSDS of pyrogallo l reveals its less hazardous nature.
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