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Indicators are substances that exhibit different colors in acidic and basic media and are used to detect the endpoint of a titration. They function by undergoing a reversible chemical change in response to the hydrogen ion concentration of the solution. Most indicators are weak acids or weak bases, where the color change is due to the equilibrium between the two forms of the indicator. For ____ ______ ___ ______ __________ _______ ______ ________ ______ __________ ________.
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