APPLICATION OF PROJECT BASED LEARNING TO INCREASE LEARNING ACHIEVEMENT OF ACID-BASE MATERIAL STUDENTS IN CLASS XI MIPA 1 AT SMA NEGERI 1 ANGSANAThis study aims to improve student learning achievement in the sub-subject of acid-base solution class XI MIPA 1 SMA Negeri 1 Angsana through the application of project-based learning (PBL). This research is a Classroom Action Research which is carried out in two cycles, each cycle consisting of action planning, action implementation, observation and

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... lection. The subjects in this study were students of class XI MIPA 1 SMA Negeri 1 Angsana in the academic year 200/2021 even semester. Sources of data come from teachers, observers, and students. The data collection technique is by test and non-test (questionnaire, observation, and interview). Data analysis used descriptive qualitative analysis techniques. The results showed that the PBL method on Acid-Base solution material, students of class XI MIPA 1 SMA Negeri 1 Angsana can increase learning activities with completeness 89% in the first cycle to 93% in the second cycle, teacher activities as a whole activity learning went well with a percentage of 89. In the 93% completeness project activities there was an increase to 100% in the second cycle. while the student achievement in knowledge competence increased from 72.4% in the first cycle to 96.6% in the second cycle.