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The aim of this study is to implement the intertextual based strategies with POE to see its potential in revealing students- threshold concepts related to salt hydrolysis topic. The qualitative research method was used by utilizing the students- worksheets, two tier diagnostic test, as well as classroom observation. There were 31 students- from 11th grade high school students who had not yet studied salt hydrolysis have participated in this study. Students- worksheets provide data about students- responses about their predictions, observation result, as well as their response in the explaination stage which has been provided by guiding questions. The result shows that there were various concepts that still become threshold concepts for students in learning hydrolysis topic.