the law of definite composition pre lab - Name: Hoa Chung...

This preview shows page 1 - 2 out of 2 pages.

Name: Hoa Chung Date: February 25, 2016The Law of Definite CompositionExperimental Procedure1.Obtain a clean, dry crucible. To ensure the crucible is dry, heat it till the crucible bottombecomes dull red in color.2.Cool the crucible and weigh them (with the lid) accurately to ±0.1 mg and record thedata.3.To each crucible, add 1.0 – 1.5g of precut to an appropriate length 18 gage pure copperwire and weigh the crucible/lid and content accurately ±0.1 mg and record.4.Add enough powdered sulfur (approximately 1g) into the crucible; avoid a large excess,because burning excess sulfur requires time.5.Bring the crucible and content, with the lid slightly ajar to evaporate sulfur dioxide (SO2)gas under the fume hood.6.Star heating them moderately first and then more intensely.7.Continue heating intensely until sulfur ceases to burn around the lid (it take about 15-25minutes).8.Toward the end of the heating cycle, play the flame around the sides and lid to evaporateany residual sulfur deposit.

Upload your study docs or become a

Course Hero member to access this document

End of preview. Want to read all 2 pages?

Upload your study docs or become a

Course Hero member to access this document

Term
Fall
Professor
N/A
Tags
Sulfur, Sulfuric acid, Hazard class, residual sulfur deposit, lid slightly ajar

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture