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This study aimed to develop a Chemistry Teaching Guide (CTG) on electrolyte solution and redox reactions based on scientific inquiry and to find out its quality through the assessment of high school chemistry teachers. The electrolyte solution and redox reaction were selected because this material easily developed activities based on scientific inquiry. The development model used was a procedural model adapted from the development model of Borg and Gall by simplifying it into 5 stages. The CTG produced was assessed by 5 high school chemistry teachers. The quality of the development results in terms of the 5 components of assessment, namely content, presentation, language, implementation, and appearance. The CTG based on scientific inquiry has been developed. The quality of CTG is in Very Good category in terms of the results of the chemistry teachers assessment. Thus, the CTG is worth to use by the teacher as a guide in the learning of electrolyte solution and redox reactions based on scientific inquiry.