unknown solid identification l.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Unknown Solid Identification PowerPoint Presentation
Download Presentation
Unknown Solid Identification

Loading in 2 Seconds...

play fullscreen
1 / 7

Unknown Solid Identification - PowerPoint PPT Presentation


  • 133 Views
  • Uploaded on

Unknown Solid Identification. General Chemistry 101/102 Laboratory Manual University of North Carolina at Wilmington. Unknown Solid Identification. Purpose. To identify a solid substance based on its physical and chemical properties. Safety Considerations.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Unknown Solid Identification' - osias


Download Now An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
unknown solid identification

Unknown Solid Identification

General Chemistry 101/102Laboratory ManualUniversity of North Carolina at Wilmington

slide2

Unknown Solid Identification

  • Purpose
  • To identify a solid substance based on its physical and chemical properties.
  • Safety Considerations
  • Exercise caution when handling the NaOH and HCl solutions. These are fairly concentrated solutions and may cause burns.
  • Dispose of all liquid wastes in the waste jar in the hood. Place solid wastes in the solid waste container.
slide3

Prepare a saturated solution of your unknown. Use this solution whenever a test calls for using the unknown solution.

saturatedsolution

  • Test 2: Record the odor of your unknown solid and solution.

http://www.nabt.org/sup/publications/

nlca/nlcapdf/11NLCAchp9.pdf

Unknown Solid Identification

  • Procedure
  • Test 1: Record the color of your unknown solid and solution.
  • Test 3: Add 10 drops of 1 M NaOH to 10 drops of your unknown solution. Gently warm the test tube to check for the odor of ammonia.
slide4

Test 4: Test the acid/base properties of your unknown solution with litmus paper.

bases turn red litmus blue

acids turn blue litmus red

  • Test 5: Clean a wire test loop and conduct a flame test using your solid unknown.

use small amount of solid for flame test

clean wire has only faint yellow flame

Unknown Solid Identification

  • Procedure
slide5

Test 5 (cont.): Identify the cation present in the flame test.

Na+flame test

Ca2+flame test

Li+flame test

K+flame test

Unknown Solid Identification

  • Procedure
slide6

Test 6: Add 10 drops of 6M HCl to a small amount of the solid unknown to test for the presence of the carbonate ion.

  • Test 7: Add 2 drops of 0.1 M AgNO3 to a small amount of the unknown solution in a spot plate to test for the presence of Cl -, Br -, I-, or CO32- ions.

AgBrorAgI

Ag2CO3

AgCl

Unknown Solid Identification

  • Procedure
slide7

Test 8: Add 2 drops of 0.1 M Pb(NO3)2 to a small amount of the unknown solution in a spot plate to test for the presence of Cl -, Br -, I-, or CO32- ions.

PbCl2orPbBr2

PbI2

PbCO3

Unknown Solid Identification

  • Procedure