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Phenolphthalein is a universal indicator and maybe used as an indicator for all acid-base titrations.
Validity
How well a test measures what it says it does.
Predictive Validity
The extent to which a score on a scale or test predicts future performance on a related outcome.
Concurrent Validity
A measure of how well a particular test correlates with a previously validated measure taken at the same time.
Construct Validity
The extent to which a test measures the theoretical construct or concept it is intended to measure.
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