Answer Happy

When vacuum-filtering compounds using a Buchner funnel, it is important to wet the filter paper with a few mL of solvent first. Why? Select one: O a. So that the filter paper sticks to the funnel before we add our product. O b. So that the filter paper is colder when we start the filtration O C. Because the filter paper would tear if it wasn't wet During the recrystallization step we filtered the mixture through a funnel with some cotton wool in the neck after dissolution of the crude product but before allowing the product to recrystallize out. Why did we heat this funnel in an oven just before we used it? Select the answer than best fits. O a. Because the product may precipitate out in the funnel if it is cold. O b. To speed up evaporation of the solvent. O C. Because the filtration will be faster if the funnel is hot. O d. In order to encourage recrystallisation of the product.