ACTIVITY Colors that run In this activity you will separate a mixture into its component parts Materials rectangular pieces of filter paper 250 mL beaker water soluble black felt pen 1.0 mL of vinegar water Procedure 1. Use a felt tip pen to make a large dot about 3cm from one end of the piece of filter paper. Let the spot dry completely. Add more ink to the spot and let it dry again. Repeat this process a few more times. 2. Pour the vinegar into the beaker and add ware until the solutin is about 2 cm deep. 3. Place the filer paper into the beaker so the end with the ink dot is closest to the water. Make sure the dot is not in the water. 4. Observe the ink spot as the water is soaked up by the filter paper. Questions 1. What colors appeared on the filter paper? Where do you think these colors came from? 2. Suppose someone told you that the black ink was a mixture. Use your observations to come up with a definition for the term mixture. Questions 1. What type of mixture are you separating? ACTIVITY Colors that run 2. What role does the burner have in the distillation process? Could the solution be distilled without the burner? 3. You notice that your sample begins to boil at 96.2C and liquid begins to 4. 5. 6. 7. drip into the collection flask. What is happening? Why is it a good idea to remove the collection flask and replace it with another as soon as the temperature of the solution begins to rise again? The temperature rises steadily and the solution begins to boil again at 102.3C. What is happening now? The temperature continues to rise until it reaches 108C and the rest of the solution boils. How many different liquids were contained in your sample? Explain. As you complete the distillation, you notice a white, crystalline film lining the inside of the flask that contained the original sample. What could this substance be? Why didn’t you notice it in the original solution?
