Abstract
Abstract: The purpose of this study was to present learning the concept of electrolysis using simple copper media to vocational high school students in grade 3. This research was conducted by making a sample of well water with CuCl₂ solution which has a concentration of 1g / L and voltage variation (1.5; 3; 4.5; 6,0; 7.5; and 9,0 V). The test was carried out by electrolysis and water quality tests consisting of solute level testing, water pH test, and water temperature test. This research was also conducted by providing pre-test questions, learning videos, and post-tests. The results showed that the most effective electrolysis method occurred in variations with a voltage of 9V. This is indicated by the value of the decrease in concentration and the increase in mass of solutes after electrolysis. Meanwhile, the test results of vocational high school students show that video-based teaching can improve students 'understanding, as indicated by the students' post-test scores that are higher than the pretest scores. This research is expected to assist in the selection of instructional media for students and to find out which electrolysis method is effective for reducing Cu levels. Keywords: CuCl₂, electrolysis, learning media, simple copper.
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