Limited-Scale Implementation of a Guided Inquiry Worksheet for Identifying Buffer Properties in Mouthwash

Buffer solutions are considered an abstract and complex topic in high school chemistry, and chemistry practicum is often constrained by limited facilities and tends to be procedural rather than inquiry based. This study analyzed the implementation of a guided inquiry based practicum for identifying buffer properties in mouthwash using a student worksheet in a limited scale trial. This descriptive quantitative study involved 12 eleventh grade students from one class at SMA Pasundan 8 Bandung, divided into four heterogeneous groups. Implementation was measured through two validated instruments, namely an observation sheet and a scoring rubric for students written answers on the worksheet. Scores were analyzed descriptively as percentages and interpreted using established practicality criteria. Results showed that implementation based on observation ranged from 75% to 100%, while the quality of students worksheet answers ranged from 81.25% to 100%, both falling into good to very good categories. Components requiring procedural and concrete skills achieved near maximum scores, whereas components requiring integrated analytical reasoning, such as formulating hypotheses and determining variables, showed comparatively lower scores. Overall, the worksheet was successfully implemented at a limited scale and shows potential for wider classroom application, with additional teacher guidance recommended for higher order inquiry stages.