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This research aims to determine whether there are differences in student learning outcomes learned using the problem Solving integrated with collaborative learning model compared to students who are taught by the conventional learning model on the subject of buffer solution. The sample was determined by the random sampling which took 2 classes which were used as the experimental class. This study used the quasi-experimental method. Test that use valid instruments and reliable (0.814). Based on test data requirement, showed that pretest and posttest value of control class and experiment class has been normal distributed and homogeneous. Hypothesis test with significant level 0.05 to increased student’s learning outcomes has been got t count  &gt; t table , its meant H a  accepted that student’s learning outcomes that has been learned by problem solving integrated with collaborative model higher than student’s learning outcomes that has been taught with conventional model. The result of observation sheet show that the learning process based on Lesson Study in this research is obtained that the student are less in saying the opinion just 75% of the student that stay saying the opinion in the class. While there are 83% of students that working together in “U” form seat.

The role of problem solving model integrated with collaborative to increase student’s learning outcomes on buffer solution