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Preparation of Phenolphthalein Indicator (Acid/Base Indicator)
1. - Weigh out 0.5 g of phenolphthalein.
2. - Prepare a 50% ethanol (ethyl alcohol) solution consisting of 50ml ethanol and 50 ml water.
3. - Dissolve the phenolphthalein thoroughly in the 50% ethanol solution.
4. - Use from a bottle fitted with an eye dropper. Store the rest in a stoppered bottle.