Identification, Properties, And Synthesis Of An Unknown Compound

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Identification, Properties, and Synthesis of an unknown Compound

Abigail Patterson
Chemistry 101 Laboratory, Section 005
Instructor: Junyan Ma
March 3, 2015

My signature indicates that this document represents my own work. Outside of shared data, the information, thoughts and ideas are my own except as indicated in the references. I have submitted an electronic copy through Blackboard to be scanned by TurnItIn.com. In addition, I have not given aid to another student on this assignment.

Goals:
The goals of the lab were to: Identify the unknown compound and Discover as many chemical and physical properties of the unknown when given 5 grams of the compound (Cooper, 2011).
Results:
Table 1: Physical Property tests
Appearance of Compound:
White, grain-like
Smell:
No smell

Table 2: Qualitative Solubility

Solubility
Water
Very Soluble
Toluene
Insoluble
Acetone
Insoluble

Table 3: pH Test

Color of pH strip pH Water
Dark green/blue
10

Table 4:Quantitative Solubility
Amount of Water added (mL)
Solubility
Amount of compound (g)
1
Insoluble
.1
2
Insoluble
.1
3
Insoluble
.1
4
Insoluble
.1
5
Soluble
.1

Table 5:Flame Test

Properties:
Color: Bright Orange/Yellow
Intensity: High

Table 6: Chemical Tests
Test for base
Positive
Test for acid
Negative
Test for chloride
Negative
Test for sulfate
Negative
Test for carbonate
Positive

Table 7
Samples
A
B
C
D
Beaker Weigh
66.19 g
101.62
66.34
111.25
Amount of compound added

.1 g of unknown compound

.2 g of unknown compound

.1 gram of Sodium Carbonate

.2 grams of Sodium Carbonate
Beaker weigh with precipitate
66.34 g
101.74 g
66.45 g
11.38 g
Weight of precipitate
.15
.12
.11
.13

Discussion of Results:
To begin with the lab we began by looking for properties of our unknown by observing the physical state of the compound. Then we conducted a solubility test involving 10 mL of water, toluene and acetone. We then tested the pH of water and the unknown using a pH test strip. The pH of the water and the unknown was a pH of 10. When a pH is 10 that means that the unknown is a base. Next, we performed a flame test to determine the chemical properties by dipping a nichrome wire into our solution and using the Bunsen burner flame. The second test we performed were a series of chemical tests such as a test for base, test for acid, test for chloride, test for sulfate, and a test carbonate. Due to the second test Na2SO4 is our unknown compound, however additional testing is needed to confirm. Week three we weighed 0.1 grams of the unknown compound into test tube A and 0.2 grams of the unknown compound into test B. There were also 0.1 grams of sodium carbonate in Test tube C and 02 g in Test tube D. Five mL of water was then added to each test tube followed by 2 mL of BaCl2.
A precipitate of barium carbonate and sodium chloride began to form. Then to isolate the precipitate from the compound the test tubes were placed in a centrifuge. Four beakers were weighted then removed the precipitates from each test tube to a beaker and placed them on a hotplate for ten minutes, which allowed the
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