What is the total number of strontium and phosphate ions you have added to your solution after two or three shakes? why are there not equal numbers of cations and anions?
Assuming that there are 36 strontium and 24 phosphate, there
aren’t any equal cations and anoins because in theory only one ionic bond is
formed by a strontium with each phosphate ion. To the point that a cation will
eventually have an excess.