Development of Simas Eric-based E-LKPD using a web sway office on the subject of acid-base aims to develop a valid E-LKPD and determine user responses in the learning process. The method used in this study is a research and development (R&D) method by applying a 4-D development model which includes Define, Design, Develop, and Disseminate. However, in this study, the dissemination stage was not…