Classroom action research using practicum method with natural indicator material is to increase the activity and comprehension of the concept of acid base titration material in students of Class XI MIA 2 MAN 1 Amuntai. This study aims to improve students' activeness and understanding on acid-base titration material using practicum method using natural indicator. Research carried out in two cycles, each cycle consists of the planning, implementation, observation, and reflection. Cycle I consists of two meetings, as well as Cycle II. Student activity data is extracted with Observation Sheet of Student Activity, Teacher Management Data is extracted with Observation Sheet of Learning Management, student learning result data is extracted by Student Result Test of class XI MIA 2 MAN 1 Amuntai and respondent's response is obtained from questionnaire given on the cycle. From the results of research conducted obtained; in the first cycle, the students' test results obtained a classical average score of 64 and a percentage of classical completeness of 33%. On the second cycle student learning outcomes classical average value of 79 and percentage of classical completeness of 83%. Practical methods using natural indicators enhance students' activeness as evidenced by increased student activity both individually and in groups. The average percentage of students who were actively involved in the first cycle was 77% and increased to 100% in cycle II. The average group activity in cycle I was 81% and increased to 93% in cycle II ..

Keywords: student test result, natural indicator, student activeness, practicum method, Acid base titration