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Before a teaching process starts, it is essential for teachers to know their students' preconceived notions and concepts of the issue at hand. In addition, teachers need to be aware of the most common misconceptions their students hold concerning particular topics. The results of the first part of our research on the theory of acids and bases show the level of knowledge and understanding primary school eighth and ninth grade students have regarding acids and bases. These results and the analyses thereof are not only to serve as building blocks for future research, but even to be of benefit to Chemistry teachers in order to prevent any misconceptions. [ABSTRACT FROM AUTHOR]