87.1 Electrolyte and electrolytic solution 2)Dissociation of substance In 1885, vant Hoff published his quantitative research on the colligative properties of solution For sucrose, the osmotic pressure (r can be expressed as: 丌=cRT But for some other kind of solvates such as Nacl the osmotic pressure had to be modified as: Jacobus henricus van 't Hoff IcRT 1901 Noble prize i, vant Hoff factor, is larger than 1. 1852/0830~1911/03/01 Discover the laws of chemical dynamic and the osmotic pressure in solutions In the paper written in Achieves Neerlandaises(1885)and Transactions of the Swedish Academy (1886, vant Hoff showed analogy between gases and dilute solutionsIn 1885, van’t Hoff published his quantitative research on the colligative properties of solution. For sucrose, the osmotic pressure () can be expressed as:  = c R T But for some other kind of solvates such as NaCl, the osmotic pressure had to be modified as:  = i c R T i , van’t Hoff factor, is larger than 1. 2) Dissociation of substance In the paper written in Achieves Neerlandaises (1885) and Transactions of the Swedish. Academy (1886), van't Hoff showed analogy between gases and dilute solutions. §7.1 Electrolyte and electrolytic solution