<span>This work has as its foundation the use of models and the structuring of a didactic unit with three learning sequences, to introduce the Science-Technology-Society dimension in the teaching of acids and bases in high school level. The introduction includes a general survey on the theoretical foundations of STS dimension, modeling in science teaching and the construction of didactic units. The importance of the topic of acid and bases is argued and the design of a STS sequence on this

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... is discussed for its application on a sixth semester high school class in Colegio de Ciencias y Humanidades of Universidad Nacional Autónoma de México.</span>