This simulation uses a step-by-step approach to calculate the number of stages for a specified distillation problem, using the McCabe–Thiele method. Click the “new problem” button to change the starting conditions. Check the “hint” box for a hint on how to proceed. After completing each step, check the “solution” box to see the correct solution and then click “next” for the next step. Once you check “solution,” you cannot change your answer. Also, you cannot return to the previous step once you click “next.”