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Chem lab 1065

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by

Kyle Gee

on 4 November 2013

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Transcript of Chem lab 1065

Unknown White Compound
Day 2
Goal: Confirm the identity of our substance with more tests
Conclusion
We were given an unkown white compound and after an array of tests determined it had to be NaCl.

To be sure, our team performed even more tests on the UWC and compared the results to NaCl to confirm the UWC's identity.

For fun, we decided to sythesize NaCl from scratch, because "Why not?!" We did even more tests on the synthesized compound and compared the results to NaCl
Experiment

Given a task to identify an unkown white compound that was found lying around the lab

We conducted a series of tests to narrow down our compound to NaCl

We synthesized the compound in lab, and compared the unknown's properties to the properties of a known amount of NaCl

Day 1
Goal: Narrow Down Possible Compounds
Procedure: Dissolve ~.25 g of compounds in 7 ml of water

Results: UNW was soluble

Eliminated: None, all compounds soluble

Ion Test
Procedure: Performed an ion test to determine the ions present in the UWC solution.

Results: Our UWC solution contained either Cl-, Br-, or I- ions

Eliminated:
Ca(NO3)2
KNO3
NaC2H3O2
(NH4)2SO4
K2CO3
Solubility Test

Procedure: Determined the PH of remaining solutions with PH Probe

Results: inconclusive; the PH probe's measurements for each solution were not comparable due to discrepancy in molarity of solutions
PH Test
Kyle Gee
Samantha Schwartz
Jack Goodsell
Tesslina Trejo

Day 3
Goal: Synthesize our compound and test its purity
Procedure: Ignited the solution of the four remaining compounds and compared the flame color to the flame of the UWC

Results: The UWC burned a bright orange flame, the same color as NaCl

Conclusion: Our compound was NaCL
Flame Test
Procedure: Dissolve the 4 possible compounds into water and compare the conductivity to UWC

Results: The compound closest in conductivity was NaCl
Conductivity Test
Procedure: expose pH strips to solutions of the remaining four compounds

Results: The pH of UWC matched closest with 3 different compounds.
PH Test
Testing Compound
Procedure: Conducted pH, Solubility, and flame tests on synthesized compound and a measured amount of the NaCl.

Results: These tests showed that our synthesized compound had the same properties as a measured amount of that compound
Procedure: Combine solutions of same molarity and volume of NaOH and HCl to from H2O and NaCl.

Results: Aquaeous solution of NaCl
Synthesization
Procedure: place NaCl solution in beaker and boil off excess water over a hot plate.

Results: The substance left in the beaker was NaCl
Separating the Solution
We have determined our compound to be NaCl. We conducted conductivity and ph tests to verify the result.
Day 2 Results!
The synthesized NaCl had the same properties as the known NaCl, and we verified this with a series of tests.
Day 3 Results!
From the solubility and ion test, only 4 compounds remained.

Remaining Compounds: CaCl2, MgCl2, KCl, and NaCl
Day 1 Results!
CaCo3
MgSO4
K2SO4
NaCO3
Na2SO4
NH4Cl
Full transcript