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10pGasometricNaHCO3 - Gasometric Determination of NaHCO3 in...

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Click to edit Master subtitle style Gasometric Determination of NaHCO3 in a Mixture Last Update: 2/2/10 07:10:04 AM
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Purpose: Determine the percent of NaHCO3 in a mixture by Gasometry Concepts: Ideal Gas LawHenry’s Law Vapor Pressure Stoichiometry Techniques: Capture Gaseous Product Corrections to volume Apparatus: Syringe Thermometer Barometer
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The Exercise is Conceptually Simple . 1. Weigh Sample, wSample . 2. Do Chemistry: NaHCO3 (s) + H+ (aq) ° Na+ (aq) + H2O (l) + CO2 (g) 3. Capture Liberated Gas and Measure its volume, vCO2 P v = n R T to get number of moles of CO2 nCO2 = P vCO2 / RT 4. Use Ideal Gas Law
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5. From the Stoichiometry of the reaction, get moles, of NaHCO3 nNaHCO3 = nCO2 6. From number of moles, get weight wNaHCO3 = nNaHCO3 * 84.0 g / mol 7. Compute Percent Composition of Sample PctNaHCO3 = 100 * wNaHCO3 / wSample
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But - it Involves Some Important Concepts Limiting Reagents Gas Mixtures – Partial Pressure Gas Solubility – Henry’s Law Departure of CO2 from Ideality Reproducibility
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The Basic Experimental Arrangement NaHCO3 HCl Syringe
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Limiting Reagent: Suppose the unknown is 100% NaHCO3 You are asked to weigh ~ 0.2 g of the unknown. What is the maximum volume of CO2 we can expect?
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