Determining solubility based on covalent character

[806154624]

In lecture, Dr. Lavelle stated that increasing the covalent character of silver halides (AgF, AgCl, AgBr, Agl) makes them less soluble as the size of the anion increases. Can someone please explain why having more covalent bonding would decrease the solubility? Is it that they can bond more with other ions so they have a harder time getting broken apart? Can someone please clarify this concept? Thank you!

[Claire1A]

As the covalent character increases, the electrons are shared more equally in the molecule, and therefore, it is more difficult for the atoms in that molecule to form ions (where the electrons are not shared, they are transferred). The molecule most break into ions in order to be soluble in water I believe.