Van't Hoff factor of 33% dissociated AlF3 solution is

They all are classified as ‘A3B’ type(uni-trivalent) electrolytes…..A3B ⇌3A++B3- ; n=4Examples….M3PO4                     Van't Hoff factor, i = 1-α+nα ;    when n= 4                    Van't Hoff factor, i = 1+3α ; n=4….for AB3 type(tri-univalent) electrolytes…...AB3 ⇌A3++3B- ; n=4Examples…..AlF3, Al(NO3)3α= Degree of ionization  (or) dissociation ; Van't Hoff factor, i = 1+3α ;  Van't Hoff factor, i = 1+30.33=2 ;