1. The problem statement, all variables and given/known data What do we mean by ion-ion repulsion during micelle formation in soaps? 2. Relevant equations None 3. The attempt at a solution I think It is about the positive and Negative charges of water getting repelled by the positive and negative charges of hydrophilic end of soap molecule.This repulsion does not allow the water to dissolve the soap molecules.Hence the soap molecules remain just like a precipitate in a colloidal solution.since ions are responsible for the formation of charges,it is called ion ion repulsion.