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Abstract

Development of Student Worksheet based Guided Inquiry to Train StudentsCritical Thinking Skills on Buffer Solution. Based on the context of the problems found in the pre-research, this study was conducted to describe the feasibility of guided inquiry-based worksheets to train critical thinking skills on buffer solution material developed in terms of validity, practicality, and effectiveness. This research used the 4-D research method. The limited trial was tested on 36 students of class XI IPA 2 SMA Negeri 1 Driyorejo. The results showed that the worksheet produced was considered very valid in terms of content and construct validity, with a mode score of 5. Practicality obtained an average response questionnaire score of 83.88% supported by observation results with an average percentage of 86.90%, 86.90%, and 95.23% with practical categories. Effectiveness is obtained from the students' critical thinking ability test, namely the pre-test and post-test with a percentage of 79.65% in the high category, 56.89% in the medium category and 24.16% in the low category.