19. a. Suppose that a student melted his pure acetanilide, 97.5%/2.5% mixture, and 85%/15% mixture samples. Suppose a second student then inserted his recrystallized samples while the thermometer still read between 80 - 105C. What could happen? The pure acetanilide sample could melt prematurely. b. The IW sample might begin to melt prematurely, leading to an inaccurate reading for the lower end of the mp range. bidon The IW sample would probably turn black. d. It would not matter because none of the samples will begin melting below 100C. The melting point capillary tubes might crack, spilling the samples. c. e. Explain