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Identification of a Sample Based on Chemical Properties

Problem Identify Components Homogenous Similar Densities Distinguish The Components Chemically. Identification of a Sample Based on Chemical Properties. Pennies Heterogeneous 5 Cent Coins Homogeneous Nickel and Copper Different Chemical Properties React Differently.

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Identification of a Sample Based on Chemical Properties

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  1. Problem Identify Components Homogenous Similar Densities Distinguish The Components Chemically Identification of a Sample Based on Chemical Properties

  2. Pennies Heterogeneous 5 Cent Coins Homogeneous Nickel and Copper Different Chemical Properties React Differently Identification of a SampleBased on Chemical Properties

  3. Copper and Nickel React With H2O2 and HC2H3O Release Metal Ions 5 Cent Coin Solution hydrogen peroxide and vinegar Heat Ni2+ Cu2+ Cu2+ Ni2+ DO NOT POUR EXCESS BACK IN BOTTLE!!!

  4. Control Solutions • Control Solutions • Aqueous Solutions • Individual Metal Ions • Observe Individual Reactions CuSO4 NiSO4 H2O CuSO4 Cu2+ + SO42- H2O NiSO4 Ni2+ + SO42-

  5. 2-3 Drops Record Observations Metal Solutions 5 cent coin 4 x 3 Well Plate Copper Nickel Ammonia Dimethyl- Glyoxime Test Solutions Potassium Iodide

  6. Best Indicator • Control Solution Color • Observation Color • Most Dramatic Change?

  7. Surface Test ammonia hydrogen peroxide • Paper Towel • Repeat if Leakage • Blot with Paper Towel (#13) DO NOT POUR EXCESS REAGENTS or SAMPLES BACK IN BOTTLE!!!

  8. Surface Test • NH4OH and H2O2 • Releases Metal Ions • 5 Cent Coin • Metal Ions Released? • Penny • Metal Ions Released? Alloy Surface? ?

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