In this Solubility Lab for High School Chemistry, students prepare four different concentrations of Potassium Nitrate solution at an elevated temperature, then watch as they cool to see at what temperature each one crystallizes. Then, they create a graph showing the relationship between Solubility and Temperature.
Good results are easy with this activity, especially since any questionable data can be easily re-done and verified. Students obtain good data for their graphs, giving a sense of satisfaction while they hone their lab skills and learn the concept of solubility.
This lab has an easy teacher set-up because there are no solutions to prepare. Student instructions have evolved over 23 years with real students of all abilities, so they are easy to follow, To see the Teacher’s Notes and Answer Key, click on the preview. It includes helpful hints for good outcomes and examples of typical student data, along with the resulting graph. The student version fits on both sides of a sheet of paper. You can require a student-written lab report, but there is also room on the student version to to fill in the data tables and answer questions.
This comes as an editable Word document and also as a PDF file.