How to prepare 1-Naphtholphthalein solution for pH indicator?
Jun 29，2026
Before using for pH testing, add 0.1 g alpha-Naphtholphthalein in 100 mL Ethanol. It transitions from pink (in acidic environments) to a brownish-blue (in basic environments) across a pH range of 7.1 to 8.3.
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alpha-Naphtholphthalein
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