Loading presentation...

Present Remotely

Send the link below via email or IM

Copy

Present to your audience

Start remote presentation

  • Invited audience members will follow you as you navigate and present
  • People invited to a presentation do not need a Prezi account
  • This link expires 10 minutes after you close the presentation
  • A maximum of 30 users can follow your presentation
  • Learn more about this feature in our knowledge base article

Do you really want to delete this prezi?

Neither you, nor the coeditors you shared it with will be able to recover it again.

DeleteCancel

Unknown White Compound

No description
by

Pakou Her

on 6 March 2014

Comments (0)

Please log in to add your comment.

Report abuse

Transcript of Unknown White Compound



Pakou Her
Melanie Johnson
Danny Huang

Unknown White Compound
The purpose of this lab was to be able to
Identify the unknown white compound
Discover as many physical and chemical properties as possible
Design and carry out a synthesis of this compound
Purpose

Day Two
Purpose: Perform Tests to Confirm Identity of Our Unknown Compound
Flame test K2SO4
Burns a violet color,
Similar result with our unknown compound
The pH of K2SO4
Ion Test
K2SO4 (aq) + BaCl2 (aq)
BaSO4 (s)
pH of unknown: 5.9
pH of K2SO4: 5.85
K2SO4 (aq) + HCl (aq) no reaction
K2SO4 (aq) + AgNO3 (aq) no reaction
K2SO4 (aq) + NaOH (aq) no reaction
Summary
The four tests we performed confirmed that our compound 653Q is K2SO4.
Day One
Purpose: To identify the unknown white compound by examining its physical and chemical properties
Flame Test
Burns a violet color,
allows us to predict our unknown contains potassium (K)

pH Test
Ion Test
Unknown + BaCl2 (aq)
BaSO4 (s)
pH of unknown: 5.9
Predict our unknown is slightly acidic
Unknown + HCl (aq) no reaction
Unknown + AgNO3 (aq) no reaction
Unknown + NaOH (aq) no reaction
Day Three
Purpose: Design and carry out a synthesis of the compound
Synthesis of K2SO4
2KOH + H2SO4 2H2O + K2SO4
Testing
In order to obtain one gram of K2SO4 we calculated that we would need 0.95mL of 6M H2SO4 and 1.9mL of 6M KOH
In order to eliminate the water from our final product we boiled the solution to evaporate the water, leaving us with only the K2SO4 substance
We are now able to predict that our compound is K2SO4. The reaction of our unknown with BaCl2 confirms that the compound contains SO4 because of the precipitate it created.
Results
Percent Yield =
0.591 g
1.00 g
x 100
Ion Test
The compound we created had no reaction with HCl and NaOH but reacted with BaCl2 to form a precipitate.
Flame Test
Conclusion
We were able to prove that we had successfully synthesized K2SO4
Possible Compounds
CaCO3

CaCl2

Ca(NO3)2

MgCl2
Conductivity Test
Equipment: Conductivity Probe, laptop
MgSO4

KCl

KNO3

K2SO4
NH4Cl

(NH4)2SO4

K2CO3
NaC2H3O2

Na2CO3

NaCl

Na2SO4
Reaction One:
Reaction Two:
Conductivity Test
Unknown 653Q: 169.5 μS/ cm
1.410 g
2.00 g
x 100
Mass of Actual Yield
Mass of Theoretical Yield
x 100
The conductivity was 155 μS/cm for 47.5 g/l of K2SO4.

This is similiar to the conductivity of the unknown, which was 169 μS/cm for 47.5 g/l of unknown
= 59.1%
= 70.5%
Solubility Test
Procedure: 1 g of unknown compond in 46 mL of water

Observations: Unknown dissolves in water
Waste Managment
Materials
Collect waste seperately into three labeled containers
K2SO4

BaCl2
AgNO3
Labware:
Beakers
Test tubes
Test tube rack
pH probe
Conductivity probe
Bunsen burner
Scale
Graduated cylinder
Stirring rod
Pipet
Chemicals:
Unknown(653Q)
H20
NaOH
HNO3
AgNO3
HCl
BaCl2
H2SO4
KOH
K2SO4
H2SO4 + 2KOH 2H2O + K2SO4
Percent Yield is 60-70%
For acids and bases we titrated them before disposing of them
http://www.vernier.com/products/sensors/con-bta/
http://www.vernier.com/products/sensors/con-bta/
http://catalog.flatworldknowledge.com/bookhub/reader/1790?e=averill_1.0-ch04_s05
http://www.ssc.education.ed.ac.uk/bsl/chemistry/phscaled.html
http://www.ssc.education.ed.ac.uk/bsl/chemistry/phscaled.html
.http://www.bbc.co.uk/schools/gcsebitesize/science/images/barium_sulphate.jpg.
http://www.alibaba.com/product-detail/High-Quality-K2SO4_116436978/showimage.html
http://edushyster.com/?p=3609
http://nzilla.wikispaces.com/Flame+Test+Lab
http://nzilla.wikispaces.com/Flame+Test+Lab
http://www.bbc.co.uk/schools/gcsebitesize/science/add_edexcel/ionic_compounds/ionicanalysisrev5.shtml
http://www.chemguide.co.uk/inorganic/group1/reacto2.html
Full transcript