Chem 287_Chapter 7

Chem 287_Chapter 7 - 287 Chapter 7: Gravimetric and...

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1 287 Chemistry Salin Lectures Page 1 287 Chapter 7: Gravimetric and Combustion Analysis Replaced by instrumental but! Good to many figures (very precise) Used to develop standards Used for C, H, N, O, halogens Are standard accepted techniques for certain analyses 287 Chemistry Salin Lectures Page 2 287 Chapter 7: Gravimetric and Combustion Analysis Example (from last time) Ag + + Cl - AgCl(s) Example 10.00 mL with Cl - treated with excess Ag + to give 0.4368 g AgCl FW = 143.321 g/mol 0.4368 g/(143.321 g/mol) = 3.048 * 10 -3 mol 3.048 * 10 -3 mol/0.01000L = 0.3048 M
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2 287 Chemistry Salin Lectures Page 3 Ideal Precipitate is … Insoluble Easily Filtered Size matters! Known, constant composition (are you likely to have these?) 287 Chemistry Salin Lectures Page 4 Precipitation Don’t want colloid (1-500 nm) particle size Crystal Growth Two Phases: Nucleation Ions or molecules form small aggregates Often on an impurity of surface
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Chem 287_Chapter 7 - 287 Chapter 7: Gravimetric and...

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