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3.—3.1 Calcium oxide.
3.2 Mannitol.
3.3 Sodium carbonate.
3.4 Hydrochloric acid solution 50% (V/V): dilute 50 ml concentrated hydrochloric acid (d = 1.181 g/ml) with water to 100 ml.
3.5 Hydrochloric acid, 0.5 N solution.
3.6 Lead nitrate solution, 10 g per 100 ml.
3.7 Sodium hydroxide, 0.5 N solution.
3.8 Sodium hydroxide, 0.05 N solution, carbonate free.
3.9 Methyl red indicator solution: dissolve 0. 1 g of methyl red in 50 ml 95% ethanol, make up to 100 ml with water and filter if necessary.
3.10 Phenolphthalein indicator solution: dissolve 0.25 g phenolphthalein in 150 ml 95% alcohol and dilute with water to 250 ml.
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