The book is the second part of the course "Fundamentals of Analytical Chemistry" and is intended as a textbook for students of chemical-technological specialties of higher educational institutions. The new, fourth edition of the textbook is significantly revised (the third edition was published in 1971). Particular attention in the book is paid to the description of the chemical experiment technique, the method of quantitative determinations, the rules of work, methods of calculating and accounting for analysis errors.