An Introduction to theory and experiment of complex chemistry in solution for the working scientists Coordination chemistry is the branch of chemistry deals with the complex study of metal and ligands. This theory popularized by Alfred Warner (Nobel Prize 1913), K Zeigler and G Natta (Jointly Nobel Prize 1963). Complex chemistry finds many applications in household, industry, medicine, chemical and biological system. This book offers readers a clear introduction to coordination chemistry in a well-paced discussion. There are four main chapters with subtitles. It traces the beginning of coordination chemistry in solution, applications and their techniques, detailed coverage includes, Introduction, importance of pyrazoles, pyrazolines, coordination complexes and factors affecting on stability complex formation. Methods to study complexes pH meter and spectrophotometer by Calvin-Bjerrum, Job's method respectively and calculation of stability constant. Experimentation, calculation of proton, metal-ligand stability constant, influence of ionic strength and dielectric constant, viscosity and refractive index measurements and Biological study.