<![CDATA[The 2013 curriculum emphasizes students to understand and appreciate how to get a concept so that understanding concepts in chemistry learning is needed to master the material as a whole. The purpose of this study was to analyze students' misconceptions using the Certainty of Response Index (CRI) on the stoichiometric material. This research is a pre-experimental research with one group pre-test post-test design. The population in this study were all students of class X MIPA SMA N 1 Demak with a research sample consisting of 35 students conducted by purposive sampling technique. Data collection techniques using 20 multiple choice diagnostic test questions are reasonable. The stages of data analysis are processing and analyzing student answers and determining whether students understand the concept, misconception or do not understand the concept by looking at the conformity with the confidence level index (Certainty of Response Index). Misconceptions are still found in all stoichiometric concepts, which include indicators of the basic laws of chemistry at the pretest of 30.5% (medium)-posttest 22.5% (low), the indicator of relative atomic/molecular mass and the concept of mole pretest 35.5% (moderate) and posttest 22.72 (moderate), and the calculation of the limiting reagent stoichiometry at the pretest was 31.70% (medium) and the pretest was 22.72 (low).]]>
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