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Exp 86 Flame Test of Some Elements:实验86测试的一些元素的火焰
Exp. 8.6 Flame Test of Some Elements Critical question: How can a flame test be used to identify the elements in a compound?. Procedure: Add small quantities of different compounds on the loop of a nichrome wire and hold it over a flame. Be careful to rinse wire and change beaker water between samples. Data Compound Formula Description of flame Potassium Chloride Copper(II) Chloride Lithium Nitrate Barium Nitrate Calcium Chloride Copper(II) Sulfate Copper (II) Nitrate Calcium Nitrate Strontium Nitrate Potassium Nitrate Sodium Nitrate Compound Formula Description of Flame Potassium Sulfate ____________ Lithium Chloride ____________ ____________ Conclusion: Questions How could you recognize sodium in a compound by doing such a flame test? How could you recognize copper? When you hold a small amount of sodium chloride in a flame, you observe that the flame is right yellow. What could you do to be sure that the color is due to sodium and not chlorine? When you spill a few drops of soup or milk on a pale- blue gas flame when cooking, the flame changes to a mixture of colors. Yellow is the most intense color. What do you conclude about this observation? * * * * * * * * * * * * * *
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