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This research was done in chemistry Education Study Program of Universitas Negeri Medan, which aimed to develop standardize and test of the chemistry module on the topic Argentometry. The research wasbegun by choosing KKNI (Indonesian National Qualification Framework) and then analyzing chemistry book on the topic Argentometry and arranged in draft. The arranged module was standardized by lectures according to the questionaire from Badan Standar Nasional Pendidikan (BSNP). The result showed that developed module met the BSNP criteria with the feasibility of: content (3.52), language (3.52) and performance (3.73) and categorized as valid without revision. Validated module was made in hardcopy and tested to preservice chemistry teachers’ 2017A as experiment class (EC), and 2017B as control class (CC) using manual book from FMIPA-Chemistry Education Unimed. Pretest average score of both EC and CC students was 20. After teaching and learning process was done, postest average score increased to be 89 in EC and 78 in CC. Science Process Skills aspect that developed were classified as high and consisted communicating in writing and orally at 95%, formulating hypotheses 90.9%, experimenting 92%, observing 87%, measuring 83% and low stage deciding tools and materials 72% respectively. The implementation of inquiry guided module, support developed module were able to improve preservice learning outcomes by 83.89%.

Developing Guided Inquiry-Based Module on Topic Argentometry to Improve Science Process Skills Preservice Chemistry Teachers