Separation of a Mixture of Solids Essay

1511 Words Mar 8th, 2013 7 Pages
PURPOSE The purpose of this experiment is to become familiar with the separation of mixtures of solid and learn separation techniques based on the chemical properties of a substance.

PROCEDURES
1. Separating out the Iron
a. Use your digital scale to determine the mass of your weighing dish.
b. Empty the entire mixture of solids from the plastic bag into the weighing dish and determine the gross mass of the total mixture and weighing dish. Compute the net mass of the mixture: this is equal to the gross mass of the weighing dish with the mixture less the mass of just the weighing dish determined in 1-A.
c. Spread the mixture into a very thin layer over a full sized piece of paper.
d. Cut a second piece of paper into a 10-cm square.
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c. Swirl the cup containing the salt and benzoic acid crystals to dislodge any crystals from the sides. Then, while holding the filter paper in place and open, pour the contents of this cup into the filter paper-lined funnel.
d. After the sodium chloride solution has fully drained through the filter paper, slowly pour 2 to 5 mL of chilled distilled water around the inside surfaces of the filter paper-lined funnel to make sure all the sodium chloride has been removed from the benzoic acid crystals.
e. After all the liquid has drained from the funnel lay the filter paper containing the benzoic acid crystals on folded layers of paper towels and put this someplace where it will not be disturbed while the filter paper and its contents air dry. Depending upon the humidity in your area this can take several hours or days.
f. When the filter paper containing the benzoic acid crystals is completely dry, weigh it and subtract the weight of the filter paper to obtain the net weight of the benzoic acid crystals.
4. Separating out the Salt
a. Remove the funnel from the above filtration assembly and set the paper cup of sodium chloride solution someplace where it will not be disturbed while the water evaporates. Depending upon the humidity in your area this might take several days. When all the water has completely evaporated only sodium chloride will be left in the paper cup.
b. Weigh the paper cup with the dried salt crystals inside and then subtract the weight of the cup to

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