This expanded issue consists of three parts. First there are a number of regular submitted manuscripts. Second, there is a manuscript by Aziz, Adnan, Sohri, Mohshim, Idris and Azman that was submitted to a special issue, based on lectures presented at the International Symposium on Solubility Phenomena held in 2018 (which was published as the July issue of this Journal), but which was not finalized in time to be included in that issue. Finally, there are five manuscripts based on lectures presented at the International Conference on Solution Chemistry, also held in 2018, along with an Introduction describing that conference.