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Unknown White Compound

Chem 1065
by

Alex Bailey

on 4 March 2013

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Transcript of Unknown White Compound

By:Alex, Sejla, Sam, and Aaron Mystery of the UWC Unknown White Compound Success? CaCl2
Ca(NO3)2
MgCl2
MgSO4
KCl
KNO3
K2SO4
NaC2H3O2
Na2CO3
NaCl
Na2SO4
NH4Cl
(NH4)2SO4
K2CO3
CaCO3 Solubility with H2O Adding HCl: no reaction
=no carbonate present
Adding BaCl2: no reaction
=no sulfate present
Adding HNO3 & AgNO3: no reaction
= no chlorine present Ionic % Yield: CaCl2
Ca(NO3)2
MgCl2
MgSO4 Purpose By: Alex Bailey, Sejla Sacic
Aaron, Sam Borchardt ~Identify compound 517P
~Discover its properties
~Devise and carry out a
plan to synthesize unknown
Possibilities: KCl
KNO3
K2SO4
NaC2H3O2 Na2CO3
NaCl
Na2SO4
NH4Cl (NH4)2SO4
K2CO3
CaCO3 .205g UWC (517P) with 3mL H2O
= SOLUBLE CaCl2
Ca(NO3)2
MgCl2
MgSO4 KCl
KNO3
K2SO4
NaC2H3O2 Na2CO3
NaCl
Na2SO4
NH4Cl (NH4)2SO4
K2CO3 pH Test Tested pH of solution created during solubility test
pH-4

Created aqueous solutions of the remaining chemcals:
~Mixed .123g chemical with 1mL H2O
(similar concentration to that of our unknown)

NaC2H3O2: pH-7
Ca(NO3)2: pH-4
KNO3: pH-4 Flame Test Created solution of .51g 517p with 10mL H2O
= red-orange flame

Created solution of .51g KNO3 with 10mL H2O
= purple flame

Created solution of .51g Ca(NO3)2 with 10mL H2O
= red-orange flame The Facts Evidence Confirmation!!!!!! :) Based on our new evidence, which shows that:
Our unknown is insoluble with sulfuric acid, showing that an ion insoluble with sulfate is present=Ca
Same with Ca(NO3)2
Conductivity patterns are similar

Conclusion: And the perpetrator is...
Ca(NO3)2!!!!!!! The Suspect: Ca(NO3)2 Soluble with H2O
pH-4
Red-Orange Flame (shows signs of Calcium)
Nitrate present Solubility with SO4 Added .24g 517p to 3mL of 6M H2SO4

precipitate formed

Added .23g of Ca(NO3)2 to 3mL of 6M H2SO4

precipitate formed Conductivity Measured conductivity using probe at 3 different concentrations
(Conductivity changes based on concentration, but the ratio between conductivity and concentration is characteristic of compounds)

Concentration to conductivity ratio of 517p increased at a rate similar to ratio found in Ca(NO3)2 Recreating the madness... CaCO3(s) + 2HNO3(l) Ca(NO3)2(aq) + H20(l) + CO2(g) Is this the right solution??? Solubility Test: -Using stoichiometry, we could calculate the amount of each reactant needed to make 1g of Ca(NO3)2 1g .51mL .61g 1) Mix .61g CaCO3 with .51mL HNO3
2) Stir (fizzing and gas released)
3) Aqueous solution formed
4) Boil on hot plate to remove H2O
5) Left with .78g of white compound Mixed .15g of synthesized compound with 3mL H2O
Soluble pH Test: Tested pH of solution from solubility test
pH-5 Flame Test: Used solution from solubility test to conduct flame test
produced red-orange flame Ionic Test: Showed no carbonate in synthesized compound Characteristics of Synthesized compound vs. Ca(NO3)2:
-Purity fairly close
-pH slightly high
-physical appearance:white, a little more powdery I THINK SO (experimental/theoretical)x100
(.78g/1g)x100=78% 78%
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