What observations would occur if...?

Question

A filtrate, X, was reacted with NaOH until in excess.
What observations would have been made when the inferences were:
1. Al3+, Pb2+, Zn2+, Ca2+ present
2. Al3+, Pb2+, Zn2+ present

Answer 1

1. white precipitate, the majority of which would dissolve on excess.
2. white precipitate, which would all dissolve on excess.