Research Article
Investigation of Acid-Base Indicator Property of Plumbagin from Plumbago zeylanica Linn
Table 9
Colour of the indicator and solvent in different solutions on evaluation of specificity.
| ā | Plumbagin | Methanol | NaOH (analyte)/HCl (titrant) | HCl (analyte)/NaOH (titrant) | CH3COOH (analyte)/NaOH (titrant) | NaOH (analyte)/HCl (titrant) | HCl (analyte)/NaOH (titrant) | CH3COOH (analyte)/NaOH (titrant) |
| Colour of the indicator before titration | Pink | Yellow | Yellow | Colourless | Colourless | Colourless | Colour of the indicator after titration | Yellow | Pink | Pink | Colourless | Colourless | Colourless |
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