Investigation of Acid-Base Indicator Property of Plumbagin from Plumbago zeylanica Linn

Figure 3

Mean ± SEM of reaction endpoints and indicator errors from titrations with plumbagin, methyl orange, and phenolphthalein. (a) Mean ± SEM of endpoint for titration of HCl with NaOH. (b) Mean ± SEM of endpoint for titration of CH₃COOH with NaOH. (c) Indicator errors of plumbagin and methyl orange in titration of HCl with NaOH. (d) Indicator errors of plumbagin and phenolphthalein in titration of CH₃COOH with NaOH. Each bar represents mean ± SEM of endpoints/indicator errors; SEM: standard error of mean.

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