This research is Classroom Action Research (PTK) which aims to determine the increase in critical thinking skills and student learning outcomes after learning using an e-module based on Scientific Critical Thinking (SCT) on buffer solution material. The research model developed by Kemmis and Mc Taggart consists of 4 stages, namely planning, implementing actions, observing and reflecting in each cycle. The research subjects were 36 students of class XI MIPA 4 SMA Negeri 4 Banjarmasin. Data collection on critical thinking abilities and student learning outcomes was carried out using test instruments. The research results showed that the students' critical thinking skills test in cycle I was 47.18 in the moderately critical category. while in cycle II it increased to a score of 81.08 in the very critical category. In the knowledge learning outcomes test, in cycle I it was 55.56 in the poor category and in cycle II it increased by 91.11 in the good category. Student responses also showed the agree category, thus the e-module based on Scientific Critical Thinking (SCT) on buffer solution material is suitable for use in learning to improve critical thinking skills and student learning outcomes.
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