11Post - CHE 133 MAKE-UP LABORATORY EXERCISE MONDAY, DEC...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Determination of NaHCO 3 Part 1 - Gasometric in a Mixture Last Update: 11/15/2007 2:42 PM CHE 133 MAKE-UP LABORATORY EXERCISE MONDAY, DEC 10, 2007 - Starting 5:00 PM Eligible Students are ONLY those who have EXCUSED ABSENCES from : ONE or MORE TEST EXERCISES or TWO or MORE PRELIMINARY EXERCISES MUST SIGN UP WITH DR. AKHTAR BY DEC 7 Final Quiz will be given at the beginning of the check-out laboratory meeting CHE 133 Lectures and Labs will not meet next week – Nov 19, 20, 21 Help sessions will meet in accordance with adjusted schedule. Purpose: Determine the percent of NaHCO 3 in a mixture by Gasometry Concepts: Ideal Gas Law Henry’s Law Vapor Pressure Stoichiometry Techniques: Capture Gaseous Product Corrections to volume Apparatus: Syringe Thermometer Barometer The Exercise is Conceptually Simple . 1. Weigh Sample, w Sample . 2. Do Chemistry: NaHCO 3 (s) + H + (aq) Na + (aq) + H 2 O (l) + CO 2 (g) 3. Capture Liberated Gas and Measure its volume, v CO2 P v = n R T to get number of moles of CO 2 n CO2 = P CO2 v CO2 / RT 4. Use Ideal Gas Law 5. From the Stoichiometry of the reaction, get moles, of NaHCO 3 n NaHCO3 = n CO2 6. From number of moles, get weight w NaHCO3 = n NaHCO3 * 84.0 g / mol 7. Compute Percent Composition of Sample Pct NaHCO3 = 100 * w NaHCO3 / w Sample The unknowns consist of a uniform mixture of NaHCO 3 and NaCl
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 But - it Involves Some Important Concepts Limiting Reagents Gas Mixtures – Partial Pressure Gas Solubility – Henry’s Law Departure of CO 2 from Ideality Reproducibility The Basic Experimental Arrangement NaHCO 3 HCl Syringe Limiting Reagent: Suppose the unknown is 100% NaHCO 3 You are asked to weigh 0.2 – 0.3 g of the unknown. What is the maximum volume of CO 2 we can expect?
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 5

11Post - CHE 133 MAKE-UP LABORATORY EXERCISE MONDAY, DEC...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online