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Lab Activity #4: Quantitative Analysis Chemical Background –

Lab Activity #4: Quantitative Analysis Chemical Background – Vinegar is a solution of water that contains acetic acid (CH 3 COOH). Baking soda is pure sodium bicarbonate (NaHCO 3 ). CH 3 COOH + NaHCO 3  NaCH 3 COO + H 2 O + CO 2. Purpose –

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Lab Activity #4: Quantitative Analysis Chemical Background –

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  1. Lab Activity #4: Quantitative Analysis Chemical Background – Vinegar is a solution of water that contains acetic acid (CH3COOH). Baking soda is pure sodium bicarbonate (NaHCO3). CH3COOH + NaHCO3 NaCH3COO + H2O + CO2

  2. Purpose – Analyze the effect of different amounts of vinegar reacting with a fixed amount of baking soda Question: How will the amount of vinegar added to baking soda effect CO2 production in the reaction? Hypothesis: ____________________________________________________________

  3. Experiment – • Place 1.00 gram of baking soda into a clean and dry test tube. • 2. Total volume of Erlenmeyer Flask = ______ mL • 3. Setup a gas collecting apparatus.

  4. 4. Add 5.0 mL of vinegar to the test tube and quickly stopper to collect the gas. • 5. Shake the test tube until no more gas bubbles form. • 6. Measure the volume of water remaining in the flask after the reaction is complete.

  5. 6. Repeat to complete the data table. Never add more than 5 mL at a time 7. Total volume of Erlenmeyer Flask = ___________ mL

  6. Analysis – • 1. Calculate the volume of gas collected for each trial. Report the data in your table. • 2. What amount of vinegar produced the maximum amount of gas? • Estimate the amount of CO2 that would be produced from 1.00 g of baking soda and 25.0 mL of vinegar. • Accurately graph your information in your lab • notebook. • Conclusion-

  7. Questions – • As you should know, CO2 is soluble in water (soda pop!), • does this affect your results? Explain. • What forms of evidence were there that a chemical • reaction took place in this experiment? • 3. What happened to the H2O and NaCH3COO produced in this chemical reaction? • 4. Adding an excessive amount of vinegar to a gram of baking soda causes no further reaction. How does this fact demonstrate the reality that atoms (fundamental building blocks of matter) probably exist?

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