The statement that Phenolphthalein is not
affected by PH is False
Phenolphthalein is a colorless
chemical compound, when added to alkaline
solutions it will turns pink, which means it
has been affected by the PH.
Phenolphthalein will remain colorless
if in acidic solution, that's less than PH of 7.
But at pH level of 8.2 it turns pink then at pH
10 it turns magenta.
Therefore, PH do affect Phenolphthalein
indicator