How will we use as an end-point indicator for this distillation? (i.e., how will
ID: 1000754 • Letter: H
Question
How will we use as an end-point indicator for this distillation? (i.e., how will we know when to stop the distillation)
The task for this lab is to deduce the alcohol content of table wine by performing fractional distillation of 50ml of wine. The temperature at the still-head will be monitored to track the temperature of the vapors exiting the fractionating column. A graph of the vapor temperature versus volume of distillate collected will be drawn. Experimental Procedure 1. Set up a fractional distillation apparatus as illustrated in Figure 1 at the end of this experiment. The apparatus must be set high enough that a sand bath heating mantel can be placed under the distillation flask. 2. Disconnect the fractionating column and pour 50ml wine into the round bottom flask to be heated. Measure the wine accurately using a measuring cylinder. Add 2 or 3 boiling chips to allow even boiling and prevent bumping. Empty any sand from the heating mantel and raise it to neatly fit around the round bottom flask. Reattach the fractionating column. 3. Check that a slow trickle of water is flowing through your condenser and turn on the power to your heating mantel by turning the variac box to 4 4. Control the power to the heating mantel with the variac box. A good distillation rate is about 1 drop per second. 5. Note the temperature at the still-head for every 1ml of liquid collected. Collect 1-2ml past 100°C.Explanation / Answer
Depending upon the boiling point of any liquid you can choose the temperature range upto which you need to distillate. The boiling poin of alcohol is 78.50 C. Collect the distillate in a flask in a temperature range of 79-850 C. Collect the distillate from temperature range 98-1000 C in seperate flask and then stop distillation. Most of the content of alcohol must be present in the first flask. However a low percentage may also be there in the later flask that can be further subjected to fractional distillation.
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