STEM Activity Prototype on Solubility Product Subject

Abstract

Research on the development of STEM activity prototype on the solubility product (Ksp) subject has been done. The purpose of this study is to develop STEM activity on solubility product subject. Research is a type of development research with the ADDIE model. Research was carried out until the development stage. STEM is education as an effort to combine some or all of the four discipline of science, technology, engineering, and mathematics into one class that is based on a connection between the subjects and real-world problems. The sample used in STEM activity is calcium hydroxide. Because it sparingly soluble in water and is widely used in daily life. A STEM activity was done by titration because of calcium hydroxide basic so that can be determined by acid. The result of this study is the determination way of the solubility product constant is conducted by titration of calcium hydroxide with hydrochloric acid. The percentage error of Ksp value in this experiment at 29oC is 43.25%. Although this value is quite large, it can be applied in learning on the subject of solubility product.