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Syntheses of Azo-Imine Derivatives from Vanillin as an Acid Base Indicator | Purwono | Indonesian Journal of Chemistry 21318 40404 1 PB

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Fig 1. The structure of the designed potential acid-base titration indicator (1)
Table 1. Variation of NaOH concentration and H2C2O4. Indicator compounds
Fig 5. A. Color change with indicator compounds and B color change with indicator compound 3, 1
Table 2. Color stability after equivalent point for NaOH solution titrated by H2C2O4 solution Concentration (M) Indicator compound 1 Indicator compound 3

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