Strengthening the argumentative models used by eleventh grade students from the Bajo Canada educational institution of the Municipality of La Plata Huila in the execution of chemistry laboratory practices is the purpose of this research work. A mixed descriptive study is carried out during a semester, where the written responses of seven students chosen at random are analyzed taking into account three moments. The experience seeks to obtain information on the degree of knowledge that students have regarding the construction of arguments, the exercise seeks to establish the application of the basic components of an argument according to the related authors in a theoretical and methodological framework, and the application has as objective to identify the level of practice by the student in the argumentation and to be able to identify by contrast the degree of strengthening achieved during the process according to the argumentation category and the textual anatomy and textual philology subcategories proposed by Sandra & Sanmarti, (2000).