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? 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 (1/4 spatulaful) dissolves in
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This note was uploaded on 02/01/2010 for the course CHE 133 taught by Professor Robertschneider during the Winter '08 term at SUNY Stony Brook.

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06pIdentchem - IDENTIFICATION OF HOUSEHOLD CHEMICALS FINAL...

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