Validity and practicality of salt hydrolysis module based on discovery learning with scientific approach to increase the critical thinking ability of 11th grade high school students

The critical thinking ability and students' learning outcomes could be improved by using module based on discovery learning. This study aimed to develop a salt hydrolysis module based on discovery learning with scientific approach and revealed its validity and practicality. The Research and Development (R & D) has been used in this research. Plomp model which consists of 3 stages, namely preliminary research, prototyping phase, and assessment phase has been applied. The research instrument used is a questionnaire in the form of validity and practicality sheet. The module is validated by lecturers and chemistry teachers and tested at two schools with medium and low student skills. Teachers and students response questionnaire has been used as practicality test. Data were analysed by Kappa Cohen formula. The validity test results showed that the module has a very high category of validity. The result of practice test by teacher and student showed that module has high and very high practicality category. Based on the results of this study, it can be concluded that the module developed was valid and practical