The fifth edition is divided into two volumes. The first volume is mainly chemical analysis, and the second volume is all instrumental analysis. The second volume * * * consists of 26 chapters and nearly 800 pages. The first book is not clear, and it is all about common acid-base titration, complexometric titration, redox titration, gravimetric method and data error, etc. Generally speaking, the fifth edition is more substantial and detailed than the fourth edition, and of course some mistakes have been corrected. I use the fifth edition of Wu Da University. One more thing, the fifth edition is more expensive !