This study aims to generate and measure the value of the validity and practicality of the E-LKPD buffer solution. E-LKPD is prepared based on a guided inquiry model. The type of research used is Research and Development using the plomp development model. The research instrument was a content and construct validity sheet as well as a practicality questionnaire. The E-LKPD was validated by 2 chemistry lecturers at Padang State University and 1 chemistry teacher, as well as a practicality test (field test) through 15 students of class XI SMAN 4 Padang. The results of the study found that the guided inquiry-based worksheets had a high level of category validity (V=0.91) and the practicality level of students with a very practical category on the score (NP=90%). This research is recommended for further research in terms of testing the effectiveness of the products that have been developed.Keywords: Guided Inquiry, E-LKPD, Buffer Solution, Plomp ABSTRAKPenelitian ini bertujuan untuk menghasilkan serta mengukur nilai validitas dan praktikalitasE-LKPD larutan penyangga. E-LKPD disusun berdasarkan model inkuiri terbimbing. Jenis penelitian yang digunakan ialah Reseacrh and Development memakai model pengembangan plomp. Instrumen penelitian berupa lembar validitas konten dan konstruk serta angket praktikalitas. E-LKPD divalidasi oleh 2 orang dosen kimia Universitas Negeri Padang dan 1 orang guru kimia, serta uji kepraktisan (uji lapangan) melalui 15 orang siswa kelas XI SMAN 4 Padang. Hasil penelitian menemukan bahwa LKPD berbasis inkuiri terbimbing memiliki tingkat validitas kategori tinggi (V=0,91) dan tingkat kepraktisan siswa dengan kategori sangat praktis pada nilai (NP=90%). Penelitian ini direkomendasikan untuk penelitian selanjutnya dalam hal uji efektivitas produk yang telah dikembangkan.Kata Kunci: Inkuiri Terbimbing, E-LKPD, Larutan Penyangga, Plomp.

This research produce LKPD STEM-PjBL (Science, Technology, Engineering, and Mathematics-Project Based Learning) integrated on Thermochemical learning, then reveal its validity and practicality categories. This type of research is Research and Development, with 4-D model consisting of: (1) define, (2) design, (3) develop, and (4) disseminate. LKPD was validated by 3 Chemistry lecturers of FMIPA UNP and 2 Chemistry teachers, then practicalited by 2 Chemistry teachers and 25 students of Class XII MIA 2 SMA UNP Laboratory Development. The validity and practicality tests were using Cohen’s kappa analysed, yielding 0.816 for the validity test and 0.837 and 0.855 for the teacher and student practicality test with very high categories. The data shows that the LKPD produced is valid and practical

This study aims to develop teaching materials in the form of Student Activity Sheets (LKPD) which are integrated in Science, Technology, Engineering, Arts and Mathematics – Project-Based Learning (STEAM-PjBL) on Acids and Bases material and are used to determine the level of validity and practicality of the LKPD that is used. developed. This research is a research (R&D) with a 4-D development model. This 4-D model has four stages, namely the stages of define, design, develop and disseminate. However, the dissemination stage was not carried out. This study used instruments in the form of content and construct validation questionnaires, teacher and student response questionnaires. This LKPD was validated by five experts consisting of a Chemistry lecturer (FMIPA UNP) and a chemistry teacher. The validation data obtained were analyzed using the v Aiken scale, while the practicality data were analyzed using a comparison of students' scores with students' maximum scores. Based on the validation questionnaire that has been analyzed, it can be concluded that the LKPD developed is valid with a v value of 0.86 with a very valid category. While the practicality of teachers and students obtained NP values of 0.85 and 0.89 with very practical categories.