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Unformatted text preview: Gravimetric Calculations Gravimetric Calculations Results are computed from two experimental measurements The mass of the sample The mass of a product of known composition (weighing form) Gravimetric Calculations Care must be taken in the treatment of acquired data. Most errors are in the negative direction The errors arent truly random Many gravimetric determinations have a negative bias Gravimetric Calculations Gravimetric Calculations Gravimetric factors Gravimetric factors Gravimetric factors Gravimetric factors Gravimetric Calculations Gravimetric Calculations Gravimetric Calculations Gravimetric Calculations Precipitation titrations Precipitation titrations Based on reactions that yield ionic compounds of limited solubility Only a few precipitating agents have the properties that allow this type of analysis Most widely used is AgNO 3 ( sometimes referred to as argentometric titrations ) Shape of titration curve Effect of concentration on precipitation curves. Curve A shows 50.00 mL of 0.0500 M NaCl with 0.1000 M AgNO3, and curve B shows 50.00 mL of 0.00500 M NaCl with 0.01000 M AgNO3. Shape of titration curve Effect of reaction completeness on precipitation titration curves. For each curve, 50.00 mL of a 0.0500 M solution of the anion was titrated with 0.1000 M AgNO3. Calculation of pAg during titration of 50.00 mL Calculation of pAg during titration of 50....
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This note was uploaded on 06/08/2010 for the course CHEM 1316 taught by Professor Rabbe during the Spring '08 term at Baylor.
 Spring '08
 RABBE

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