Flame Test Key - Investigation 1.4.1: Creating a Flame Test...

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Investigation 1.4.1: Creating a Flame Test Key Materials: Eye protection Nichrome test wire Scoopula 2 test tubes Test tube rack Bunsen burner Hydrochloric acid, dilute, 5 ml Strontium chloride solution, 3 ml Samples of: - Sodium chloride - Barium chloride - Calcium chloride - Strontium chloride - Strontium nitrate - Copper ( II ) sulfate - Unknown substance Procedure: 1. Obtain your samples (the solids and 3 ml of the sodium chloride solution in a small test tube) and the 5-ml hydrochloric acid solution (also in a small test tube). Store the test tubes in a rack. 2. Light the laboratory burner and adjust it until it is burning with a blue flame. 3. To clean the nichrome test wire or Scoopula, dip it in the hydrochloric acid, and then hold the wire in the flame of the laboratory burner. Repeat the procedure until the wire or scoopula adds no colour to the flame. 4. Pick up a small amount of solid barium nitrate with the wire loop. Hold the end of the wire in the flame. Record your observations. 5. Clean the wire or scoopula as in step 3.
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6. Pick up a small sample of solid strontium chloride on the wire loop. Hold the end of the wire in the flame for several seconds. Record your observations. 7. Clean the wire or scoopula as in step 3. 8. Dip the nichrome test wire in the strontium chloride solution. Hold the end of the wire in the flame and record your observations 9. Repeat step 4 with each of the solid samples, remembering to clean the wire of scoopula after each test. Record your observations. Data Collection and Processing: Table 1: Qualitative Observation of Compounds Qualitative Observation the Samples Samples Formula Observations Sodium Chloride NaCl The sodium chloride is a solid. White crystals Reflective Barium Chloride (BaCl 2 ) BaCl 2 Solid White crystals Calcium Chloride CaCl 2 white solid small white pellets Strontium Chloride SrCl 2 White crystalline solid The solid had a pale yellow accent. Strontium Nitrate Sr( N O 3 ) 2 It is a white granular solid The strontium nitrate is in the form of a powder Copper ( II ) sulfate Cu S O 4 The copper ( II ) sulfate is a bright blue colour with glistening surface and looks more like small, bright shards. It is a blue crystalline solid
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Strontium Chloride solution Sr( N O 3 ) 2(aq ) neutral aqueous solution It was a clear solution and the strontium chloride dissolved in the water and there were no traces of a precipitate in the solution. Unknown
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This note was uploaded on 11/23/2009 for the course HIS HIS1d03 taught by Professor Dr.adams during the Fall '08 term at McMaster University.

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Flame Test Key - Investigation 1.4.1: Creating a Flame Test...

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