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Examples
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An apt illustration of these chemical changes of color is found in what is known as the phenolphtalein test solution, which is colored deep purplish-red by alkali hydrates or carbonates, and then by the addition of an acid rendered colorless, to be again reddened by an overplus of the alkali and so on ad infinitum.
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After cooling, the excess acid in the solution required 2,34mL of 0,01063M NaOH when titrated to a phenolphtalein end point.
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