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This study aimed to describe the profile of students- mental models of SMA Negeri 1 Singaraja on the topic of acid-base. The study was survey research. The population consisted of 279 people of 11th-grade students of Mathematics and Natural Sciences Classes of SMA Negeri 1 Singaraja in Buleleng Bali at an academic year of 2018/2019. In this study, all members of the population became members of the sample. The data needed in this study were the students mental model scores. Data were collected by a diagnostic test. Data were analyzed descriptively by grouping students mental models into three types, including scientific, synthetic, and initial mental models. The results showed that students had scientific, synthetic, and initial mental models of 2.69%, 61.766%, and 35.56% respectively.