Abstract
This study aims to determine students’ understanding of concepts using a two-tier multiple-choice diagnostic test on acid-base material. The number of samples is 31 respondents. This type of research is descriptive qualitative. The instrument used is a Two-Tier Multiple-Choice Diagnostic Test. The first level consists of 5 answer choices, and the second level consists of 5 reason choices. The number of questions is 15 items. The results showed that students in the category of understanding concepts were 78.552%, misconceptions were 13.704%, and students in the category of not understanding concepts were 7.74%. Students understand the concept is in the high category of the three categories.
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