Abstract
The study on solubility equilibrium materials based on Lesson Study (LS) have been conducted by chemistry teachers in Kampar District, Riau. This lesson study was involved three main step, namely step plan (planning), do (open class) and reflection. Meanwhile the selected samples in this study were student of Senior High School 1 and chemistry teacher community in Kampar District, Riau. The number of chemistry teacher community and student were involved 6 peoples and 35 peoples, respectively. Research data was analyzed descriptively quantitative. The average score of students’ critical thinking abilities was obtained by 84.21 with very high criterion quality and average score of critical chemistry teacher’s ability on chemical equilibrium material equal to 68 with high criterion. The results of this study indicate that the process of making module discussions and application of solubility equilibrium module can improve the ability of chemical teachers’ thinking effectively.
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