What appearance of an acidic analyte solution containing phenolphthalein indicates the endpoint of titration with a basic solution?

When the solution becomes colorless

Explanation:

phenolphthalein in a base gives a purple colour. As the acid is introduced, the purple color begins to fade away. The end point of the reaction is attained when the solution becomes colorless.

fe 55.85 g/mol and h2o 18.02 g/mol.