ALEVEL CHEM coordination numberWatch
Co-ordination number means the number of atoms bonded to an atom- so like in a covalent bond.
One of the factors of solubility is 'Common-Ion effect'- when one component in the solute (coordination number) is also in the solvent.
The more coordination number means more atoms --> more atoms added to the solution --> increase in solubility as there is more of the solute as they are in the solvent too, which makes the solution. (I think? Hope that helps )