Chemistry being a central science is based upon experiments and observations. To verify the theoretical knowledge of chemistry, experiments must be carried out to observe the facts. For example to identify a simple organic acid, say ethanoic acid, theory says that it will form effervescence of carbon dioxide gas when the acid is treated with 5% aqueous solution of sodium bicarbonate solution. To justify the fact, you are to take the supplied liquid sample of ethanoic acid in a test tube and prepare 5% solution of sodium bicarbonate in water.
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