eng Science and Education Publishing World Journal of Chemical Education 2375-1657 2023-02-05 11 1 4 6 10.12691/wjce-11-1-2 WJCE20231112 article Common Dimer - Responsible for the Trends in pKaHs of Both Pyridazenium Cations and Di-cations: An Educational Perspective Sanjeev Rachuru 1 Pandiri Sreedhar 1 D. A. Padmavathi 2 V. Jagannadham jagannadham1950@yahoo.com 2 Department of Chemistry, Geethanjali College of Engineering and Technology, Cheeryal-501301, India Department of Chemistry, Osmania University, Hyderabad 500007, India A species formed by dimerization from monoprotonated 1,2-pyridazine i.e., 1,2-pyridazenium cation that was optimized by DFT calculations is identified as a common dimer to explain the systematic changes in the pKaHs of both Pyridazenium cations and Pyridazenium di-cations. http://pubs.sciepub.com/wjce/11/1/2/wjce-11-1-2.pdf Pyridazenium cation dimer pKaHs 1 2-pyridazine 1 3-pyridazine 1 4-pyridazine