Development of a virtual laboratory for qualitative analysis of cation groups III and IV based on multiple representations with internet-integrated to support online practicum

In chemistry, there are multiple representations, namely macroscopic, symbolic, and submicroscopic, to make it easier for students to master abstract and complex chemical concepts. The appearance of problems such as the COVID-19 pandemic makes face-to-face learning difficult to do, so that learning media is needed to bridge these problems. The objectives of this research and development are to produce and describe the feasibility of virtual laboratory products in practicum qualitative analysis of cations group III and IV based on multiple representations with internet-integrated to support online practicum. The method used in this research is the research method of 4D model development with define stage, design stage, develop stage, and disseminate stage. The research has reached develop stage and has been tested with media validation of 88%, material validation of 83%, validation with teachers in the field of chemical analysis of 91%, as well as readability test for students in the field of chemical analysis and students majoring in chemistry respectively 94% and 90%. Based on these results, it shows that this virtual laboratory is in very valid criteria and can be used to support practicum activities.