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Paragraph 3 REAGENTS

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3.1

Hydrochloric acid, 0.5 M solution.

3.2

Sodium hydroxide, 0.5 M solution (carbonate free).

3.3

Phenolphthalein indicator solution: dissolve 0.25 g phenolphthalein in 150 ml 95% ethanol and dilute with water to 250 ml.