1. The problem statement, all variables and given/known data For fractional distillation, should the cyclohexane-toluene mixture appears to reflux at the bottom of the fractionating column but is not going up the column, what is the most appropriate action to do? 2. Relevant equations - 3. The attempt at a solution I was thinking of adding more boiling chips into the round bottom flask, but how about increasing the temperature of the flame and insulating the column? Or the best action is to leave it alone as it is?