Phenolphthalein sodium hydroxide kinetics
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it is an indicator used for verification
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If excess base is present at the end of an acid- base titration, the pink phenolpthalein color fades if the solution is allowed to stand far a while.this slow fading is of no consequence to the titration. However the fading of phenolpthalein in basic solution is an excellent example of second order reaction kinetics.
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