A standard HCl solution is titrated to a pink phenolphthalein endpoint by adding a NaOH solution whi — Laboratory Chemistry Chemistry Question
Question
A standard HCl solution is titrated to a pink phenolphthalein endpoint by adding a NaOH solution while stirring. If a solution becomes pink throughout but loses its color upon standing for a short time, what should be done to restore the color?
A.
Add more phenolphthalein indicator.
B.✓ Correct
Add an additional drop of NaOH solution.
C.
Add an additional drop of HCl solution.
D.
Stir more vigorously.
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