This research was using qualitative method. The extract synthesis in paper form and be used as practical tool to replace litmus paper in determining acid-base characteristics of solution. Synthesis natural indicator paper from turmeric extract (Curcuma domestica), hibiscus flowers extract (Hibiscus rosasinensis), adam hawa extract (Rhoeo discolor), asoka flowers extract (Saraca indica), determine the range of pH and its feasibility. Turkey: Department of Primary Education, Mustafa Kemal University.This research aimed to synthesis the natural indicator paper, determine the range of pH and its feasibility. Development of two-tier diagnostic instrument and assess studentsвЂ™ understanding in chemistry. Journal of Science and Mathematics Education in Southeast Asia. Multiple Perspectives of Conceptual Change in Science and the Challenges Ahead. 2013.Miskonsepsi dan Perubahan Konsep dalam Pendidikan Fisika. Common Student Misconception in Electrochemistry: Galvanic, Electrolytic, and Concentration Cells.Journal of Research in Science Teaching (JRST), 34: 377вЂ“398. Analisis Miskonsepsi Konsep Laju dan Kesetimbangan Kimia pada Siswa SMA, Makalah, Yogyakarta: Pendidikan Kimia FMIPA, Universitas Negeri Yogyakarta. Identifikasi Miskonsepsi Siswa SMA Pada Konsep Faktor-faktor yang Mempengaruhi Laju Reaksi. Nazar, M., Sulastri, Sri W, and Rakhmi F. Identifikasi Pemahaman Konsep Larutan Asam Basa Melalui Gambaran Mikroskopik Pada Siswa Kelas Xi Ipa Sma Negeri 5 Malang. StudentsвЂ™ Microscopic, Macroscopic, and Symbolic Representations of Chemical Reactions. Misconceptions and the Certainty of Response Index (CRI). International Online Journal of Educational Sciences, 4 (3): 544-553. Student Concept Understanding of Natural Products Chemistry in Primary and Secondary Metabolites Using the Data Collecting Technique of Modified CR. 2010, A Physics Lesson Designed According to 7E Model with the Help of Instructional Technology (Lesson Plan), Turkish Online Journal of Distance Education, 11(1): 98-113. Upaya untuk Mengatasi Kesalahan Konsep dalam Pengajaran Kimia dengan Menggunakan Strategi Konflik Kognitif. Procedia Social and Behavioral Sciences 15:600вЂ“60.Д®ffendy. Development of a three-tier test to assess high school studentsвЂ™ understanding of acids and bases. Interdisciplinary Journal Of Contemporary Research In Business 4(9).Д«erg, E V.D. According to the data analysis showed that Modified Certainty of Response Index (CRI) is effective used to analyze studentsвЂ™ misconceptions and the diagnostic interview is effective used to know the reasons that caused students which having misconceptions.ДЄqeel, A, and Ayyal A. The type of misconception occurred is a conceptual misunderstanding. Based on the diagnostic interview has shown that misconception occurred in students due to students does not understand the concept well and they related the one concept to the other concepts with partial understanding, the result students make the failed conclusions. The result of data analysis has shown that misconception occurred in high cognitive class, gained 43,86% and misconception occurred in low cognitive class, gained 24,63%. Further analysis of using Modified Certainty of Response Index (CRI) as a diagnostic instrument is used to explore misconception which in that test included evaluating only content knowledge with considering the reason behind the students' choice of response and their certainty of response in every question. The design of this study is a descriptive method, involved 148 of 11 th grade science students from Senior High School, which divided into two classes are high cognitive and low cognitive. The authors in this paper draw attention to the importance of an instrument that can analyze studentвЂ™s misconception.This study described the kind of the misconception in acid-base theory, and the percentage studentsвЂ™ misconception occur in every subconcept of acid-base theory.

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