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Acetic acid food additives Phenolphthalein indicator solution
Dissolve 1 g of phenolphthalein in 100 mL of ethanol.
Acetic acid food additives Procedure:
Weigh 2.5 g of the sample accurately to 0.0001 g into a stoppered conical flask containing 50 mL of carbon dioxide-free water. Add 3 drops of phenolphthalein indicator solution and titrate with sodium hydroxide titrant (1 mol/L) until a faint pink color appears. Each 1 mL of sodium hydroxide titrant (1 mol/L) is equivalent to 60.05 mg of C₂H₄O₂.Acetic acid food additives.