Ideal and Non-ideal Solutions

Every binary liquid solution can be classified by how closely it follows Raoult's law across the entire range of composition -- from pure A, through all intermediate mixtures, to pure B. A solution that obeys Raoult's law throughout is called an ideal solution (section 9.8.1); one that does not is a non-ideal solution (section 9.8.2), which shows either a positive or a negative deviation depending on the relative strength of A-A, B-B and A-B intermolecular attrac …