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Unknown White Compound Lab

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by Mary Baniel on 15 November 2012

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Transcript of Unknown White Compound Lab

Mary Baniel
Kristen Doucette
David Swanson
Tianlin Xu Unknown White Compound Purpose of the Lab What is the mysterious white compound? The purpose of this lab is broken into two parts. The first is to identify the compound by identifying it's physical and chemical properties. Using various tests we can compare compounds to the UWC.

The second part of identifying the compound is synthesizing the compound and then testing the created compound. Use the same tests from day 1/2, to compare the results and the created substance Why Is This Lab Important? Identifying unknown chemical substances is an extremely important, and scientifically fantastic capability. Using the various tests to identify unknown substances we can tell whether a substance is toxic, highly reactive, or easily/difficult to dispose of. In every day life we can use this process to help clean up chemical spills, or even identify the mysterious white salt that forms on your cooking pans from boiling water. Physical Characteristics Compound has been crushed or ground into powder
compound was soluble in water Day One : Jdentify Compound & Determine Properties pH Tests & Conductivity 1.Made solutions of all possible compounds (100mL Water / 1g Compound)
2. used pH and conductivity probes with Logger Pro to read values
3. Compared values to unknown and ruled out highly dissimilar values. (ranged fro 50uS to 20000uS, UWC was 8900uS) Results for Day One Appearance- See what the compound looked like compared to other white compounds
Solubility Test- compare solubility of unknown compound to known compounds
Cation/Anion Tests- check if specific anions/cations are present
pH & Conductivity- measured for a solute of every compound, and compared to unknown. Day Two: Verify Identification using Additional Tests Conductivity Test Flame Test Density Test Same procedure as day 1 Compound Cond 1 Cond 2
KNO3 6542 6896
NaC2H3O2 8481 8176
UWC 8688 8639 The white compound is either KNO3
or NaC2H3O2 Dip wire in 1 M HCL, Burn(clean), dip wire in solution, test in bunsen burner Results!
KNO3- purple
NaC2H3O2- orange
Unknown- orange weigh out 1mL for each compound solution, compare weights find similar weights Results
NaC2H3O2, .437 g
Unknown, .633g
KNO3, 1.039 .151 g/15.1mL NaC2H3O2
.162 g/ 16.2mL KNO3
.152 g/15.2mL Unknown Day Three: Synthesize Compound Synthesis Reaction:
NaOH + HC2H3O2--> H20 + NaC2H3O2
(Acid-base reaction) Perform Flame Test & Conductivity Test Flame Test tested synthesized compound, orange flame! Conductivity Test 6889 tested conductivity Procedure to Synthesize Compound 1. Add 4.06mL NaOH & 5mL HC2H3O2
2.test pH until neutral
3. heat beaker until white salt is produced
4. heat in oven for 30 min
5 test compound by making new solution & performing tests Identity of The Compound NaC2H3O2 Goal: produce 1 gram of NaC2H3O2 Conclusion Unknown Compound: NaC2H3O2
Percent Yield: 87%
tested compound on day three, with flame and conductivity tests
orange flamed produced & conductivity of 6889 Role Assignments
David: Recorder
Kristen: Team Leader
Mary: Communicator
Frank: Waste Management Cation & Anion Tests Halides Test- Added 1 mL of 6M HNO3 & 1mL of .1M AgNO3 to a 1 mL unknown solution. No Precipitate formed!

sulfate Test- Added 1 mL of 6M HCL & 1mL .1M BaCl2 to 1 mL unknown. No Precipitate formed!

Ammonium Test- Add 1 mL of 6M NaOH to 1 mL unknown. No ammonia smell

Carbonate Test- Add a few drops of 6M HCl to 1 mL unknown. No fizzing! Changes to Lab When we did the conductivity tests, we did not measure any reference sample, we assumed that the probe was in calibration.
- When we verified the synthesized compound by checking it's conductivity, we could have made up a solution of known compound to measure at the same time. We don't know if the solution we made was off a bit or if the probe was off.
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