Abstract:

Combined with the students' majors, the practice of applying the situational teaching method in the colligative properties of dilute solutions in agricultural general chemistry was discussed. This teaching practice is beneficial for students to improve their interest in learning and the learning effect. There is no unified expression for vapor pressure lowering constant k of the colligative properties of dilute solutions in domestic general chemistry courses. This work made theoretic analysis of the expression of k based on the equation derivation of vapor pressure lowering. The results show that the different expression forms of vapor pressure lowering constant k are due to the unit of the physical quantity. We believe this work can reduce the probability of making mistakes. It also helps students understand and master vapor pressure lowering and other colligative properties of dilute solutions.

Key words: Situational teaching, Dilute solution, Colligative property, Vapor pressure lowering, Vapor pressure lowering constant