06pIdentchem - IDENTIFICATION OF HOUSEHOLD CHEMICALS FINAL...

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Click to edit Master subtitle style IDENTIFICATION OF HOUSEHOLD CHEMICALS FINAL EXERCISE – 105 Points Last Update: 2/2/10 07:10:08 AM
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Can YOU determine and describe 7 properties of a substance sufficiently completely so that: ? QUESTIONS ? Can YOU, with other investigators, another investigator can tell if she has the same substance or not from her determination of the same properties? establish & confirm the identity of the substance by comparison of its 7 properties with those of a list of possible substances?
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Purpose: 1. To examine & describe properties of an unknown substance 2. To identify others with the same substance 3. To identify the substance 4. Confirm identification Concepts: Observation and Description of Material Properties Branching Procedures Solubility Oxidation / Reduction Heat effects Techniques: Solubility determination Reporting Observations Apparatus: Test Tubes pH Paper Bunsen Burner Melting Point Apparatus
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4 Solubility / Reactivity tests 1. Solubility in/Reactivity with Water 2. " Ammonia 3. " Vinegar 4. " Rubbing alcohol 3 other tests 5. pH of aqueous solution of unknown 6. Reactivity with tincture of iodine 7. Behavior at high temperature WHAT ARE THE SEVEN TESTS?
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Why these four solvents? 1. Water - The most common terrestrial solvent (Hydrogen bonding makes solubility in water a complex chemical phenomenon) 2.Aqueous ammonia - A basic aqueous solvent Likely to dissolve and react with acidic substances 3. Vinegar (aqueous acetic acid) - An acidic aqueous solvent Likely to dissolve and react with basic substances 4. Rubbing alcohol (isopropanol) - A non-aqueous solvent Likely to dissolve non-polar materials SOLUBILITY / REACTIVITY TESTS
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test tubes HOW TO DO SOLUBILITY TESTS Operational definition of solubility : Solid is soluble in a solvent if ~20 mg
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