Experiment_608_Six Unknown Solutions_1_1_2
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Student Name |
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Laboratory Date: Date Report Submitted: |
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Student ID |
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Experiment Number and Name |
Experiment 608: Six Unknown Solutions
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Experiment 608: Six Unknown Solutions
Section 1: Purpose and Summary
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Determine if a chemical reaction has taken place when two solutions are combined.
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Determine the identity of six unknown solutions.
In this experiment, students are provided with a set of six solutions: Cu(NO3)2, CuSO4, BaCl2, KIO3, Na2C2O4, and NaCl, and the same set of solutions in a set of ‘unidentified’ numbered/lettered bottles. Students will conduct different reactions that involve combination of two known solutions and generate experimental data that will help them identify the set of unknown solutions.
Section 2: Safety Precautions and Waste Disposal
Safety Precautions:
Use of eye protection is recommended for all experimental procedures.
Wash your hands after working with metal solutions. Do not eat in the laboratory.
Waste Disposal:
While you are doing the experiment, collect all waste into a beaker.
When you are finished with the experiment, pour the contents of the waste beaker into the inorganic waste container in the fume hood.
Section 3: Procedure
To determine whether a reaction occurs or not, observe any bubble formation (gas evolution) in the solution, a change in color of the solution, or formation of a precipitate. Record your observations at the time of mixing. If there is a precipitate, write ‘ppt’, and indicate the color. Where there is no evidence of reaction, write ‘NR’. See the suggested data tables after each section below.
Part 1: Known solutions
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NaCl |
KIO3 |
Cu(NO3)2 |
Na2C2O4 |
BaCl2 |
CuSO4 |
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BaCl2 |
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X |
Na2C2O4 |
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X |
X |
Cu(NO3)2 |
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X |
X |
X |
KIO3 |
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X |
X |
X |
X |
Part 2: Unknown Solutions
Record your Unknown Set # tested here: __________ |
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F |
E |
D |
C |
B |
A |
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B |
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X |
C |
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X |
X |
D |
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X |
X |
X |
E |
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X |
X |
X |
X |
Section 4: Identification of Unknown Solutions
Based on your data and observations above, determine the identity of each of your unknown solutions. Clearly explain each step of your reasoning.
Solution |
Identity |
Experimental basis of your identification |
A |
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B |
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C |
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D |
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E |
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F |
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Post-lab Questions:
Write the net ionic equation for each of the reactions that occurred in this experiment.