Name: Soo Jin Park
Date: 04/19/2015
Exp 3: Separation of a Mixture of Solids
Lab Section: 73426

Data Tables:

Step 1: Separating out the Iron

Mass of weighing dish __0.5_g
Mass of weighing dish and total mixture __2.8 g
Net mass of the original mixture __2.3 g Mass 10-cm square paper __0.8__g
Mass 10-cm square paper and iron filings __1.4__g
Net mass of the iron filings __0.6 _ g

Step 2: Separating out the Sand

Mass of weighing dish __0.5__g
Mass of weighing dish and dry sand __1.2__g
Net mass of the dry sand __0.7_g

Step 3: Separating out the Benzoic acid

Mass of paper cup __2.0_g
Mass of filter paper __0.7__g
Mass of filter paper and dry benzoic acid __1.1__g
Net mass of the dry benzoic acid __0.3__g Step 4: Separating out the Salt

Mass of cup and dry sodium chloride __2.5__g
Net mass of the dry sodium chloride __0.5__g

Substance
Grams
Percent of mixture
Iron filings
0.6g
28.6%
Sand
0.7g
33.3%
Table Salt
0.5g
23.8%
Benzoic Acid
0.3g
14.3%

Conclusion:

The purpose of this experiment is to become familiar with the separation of mixtures of solids. I could learn how to separate mixtures using techniques based on the chemical properties of a substance.

Iron filings could be removed by the magnet for its properties to be attracted to a magnet. The sand also could be separated from benzoic acid and table salt by using its insolubility in water. Both of benzoic acid and table salt are soluble in water, and could be separated by using their different freezing points.

To get the accurate result and reduce errors, it was crucial that the mixture should be dissolved completely in water on the each melting points and the filter paper containing the