The book "Theoretical justifications and calculations in qualitative analysis" by Vasilyev V. P. is an in-depth and comprehensive study focusing on one of the key areas of chemical science qualitative analysis. This edition will be of particular interest to students, graduate students, and professionals working in the fields of chemistry, analytical chemistry, and related disciplines. It not only covers theoretical aspects, but also offers practical approaches to solving actual problems of qualitative analysis. Vasilyev V. P. — a well-known scientist and practitioner, whose work has already won recognition in scientific circles. He has many publications and studies that relate to both the basics of chemistry and its applied aspects. In this book, the author shares his knowledge and experience, which makes it especially valuable for those who seek to deepen their knowledge in this area. The book begins with a discussion of the basics of qualitative analysis, including its significance and role in chemical research. Vasiliev carefully considers the theoretical foundations on which qualitative analysis is based, and offers the reader unique methods and approaches to calculations. This allows not only to better understand the process of analysis itself, but also to learn how to apply the knowledge gained in practice. One of the key topics raised in the book is the importance of accuracy and reliability of the results of qualitative analysis. Vasilyev focuses on how errors in calculations can affect the final conclusions and results of studies. It offers the reader a number of recommendations to minimize such errors, which makes the book especially useful for students and young professionals who are just beginning their journey in analytical chemistry. The book also covers modern methods and technologies used in qualitative analysis, including process automation and the use of computer programs for data processing. This makes the publication relevant in the context of the rapid development of scientific technologies and the emergence of new tools in laboratory practice. Readers interested in topics related to qualitative analysis can find many useful ideas and practical recommendations in this book. It will be of interest to both students and experienced professionals who want to refresh their knowledge or master new techniques. The book is suitable for those who are fond of chemistry, analytics, as well as anyone who wants to expand their horizons in scientific activities. The author's style is distinguished by clarity and accessibility, which makes it easy to assimilate even the most complex concepts. Vasilyev V. P. skillfully combines theory with practice, which makes his works especially valuable for readers seeking not only theoretical knowledge, but also their practical application If you are looking for literature that will help you better understand qualitative analysis and its theoretical foundations, “Theoretical substantiation and calculations in qualitative analysis” will be an excellent choice. This publication will not only enrich your knowledge, but also inspire new research and discoveries in the field of chemistry. Do not miss the opportunity to get acquainted with the work of Vasilyev V. P. , which will certainly take a worthy place in your library and become a reliable assistant in your scientific career.