Lecture_31_112811 - Lecture 31 Analysis of Consumer...

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Lecture 31: Analysis of Consumer Products Goals: To examine the chemical properties of some common substances found around the house. To use spot tests to learn which inorganic cations and anions are found in these products. Describe how temperature, concentration and catalysts affect the rate of a reaction. Outline (Timberlake 5.1, 8.2, 8.3, 9.1): - Experiment 5: Analysis of Consumer Products - Octet Rule and Ions (5.1) - Electrolytes and Nonelectrolytes (8.2) - Solubility (8.3) - Rate of Reactions (9.1) Problems for Extra Practice: 9.3, 9.5
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Consumer Chemicals • Many household chemicals are simple inorganic salts • Qualitative analytical techniques can be used to identify some of the ions present in the compounds
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Detection of Inorganic Chemicals • Identify the ions that make up the inorganic sample – Cations – ions that carry positive charge • Na + , NH 4+ , Ca 2+ , Cu 2+ and Al 3+ – Anions – ions that carry negative charge • Cl - , HCO 3 - , CO 3 2- , SO 4 2- , PO 4 3- • Each ion gives a characteristic reaction – Precipitate, gas bubbles or color change
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Objective Part A To examine the chemical properties of some common substances found around the house. To use spot tests to learn which inorganic cations and anions are found in these products. Part B To go through an analysis scheme to identify an unknown consumer chemical.
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Materials • Bunsen burner • Graduated cylinder, 10 mL • Spatula • Disposable pipettes • Small beaker • Conductivity tester • Litmus paper • Copper wire
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Caution • Although we are using chemical substances common to our everyday life, conduct this experiment as you would any other. Wear appropriate safety clothing and eye protection; do not taste anything; and, mix only those substances as directed. • Before adding any substance to glassware, ensure that
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This note was uploaded on 01/18/2012 for the course CHEM 120A taught by Professor Leahmiller during the Fall '11 term at University of Washington.

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Lecture_31_112811 - Lecture 31 Analysis of Consumer...

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