11pGravimetricNaHCO3

# 11pGravimetricNaHCO3 - Final Exercise 105 points...

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Click to edit Master subtitle style in a Mixture Final Exercise – 105 points Gravimetric Determination of NaHCO3 Last Update: 2/2/10 07:09:28 AM

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CHE 133 MAKE-UP LABORATORY EXERCISE Friday (tomorrow) After Quiz, before checl out either a TEST (105 point) or PRELIMINARY (55 point) Exercise MUST SIGN UP TODAY All students will do SUSB-055 (Do pre-lab) Download at: http://www.ic.sunysb.edu/Class/che133/susb/SUSB055.pdf
Purpose: Determine the percent of NaHCO3 in a mixture by Gravimetry Concepts: Thermal Decomposition Constant Weight Techniques: Weighing Apparatus: Analytical Balance Bunsen Burner Crucible Crucible Tongs

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This Part of the Exercise is, again Conceptually Simple. 1. Weigh Sample, 2. Decompose the sample by heating 3. Weigh product to get weight of CO2 & H2O lost weight loss = wCO2 + wH2O = nCO2 * 44.01 + nH2O * 18.02 2 NaHCO3 (s) Na2CO3 (s) + H2O (g)+ CO2 (g) wSample . weight Molar mass + NaCl (s) + NaCl (s) 2 NaHCO3 (s)
4. Get moles of CO2 and H2O lost NaHCO3 (s) ½ Na2CO3 (s) +

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11pGravimetricNaHCO3 - Final Exercise 105 points...

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