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CHEM120 - EXP1 - CARBON DIOXIDE FROM AN ANTACID TABLET...

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CARBON DIOXIDE FROM AN ANTACID TABLET EXPERIMENT #1 % Calcium carbonate reacts with acid and produces carbon dioxide 1. CaCO 3 + 2HCl Ca 2+ + 2Cl + H 2 O + CO 2 OR 2. CO 3 2= + 2H + H 2 O + CO 2 Apparatus and Chemicals: 3- 125mL Erlenmeyer flasks 1-tweezer 3- small vials 1- 3-holed rubber stopper, set with a 2-way 1- spatula valve, a temperature probe and a pressure sensor 1- weighing plate ~2.5g CaCO 3 ethanol 1 antacid tablet HCl (4.5M) PROCEDURE: PREPARATION OF THE APPARATUS Verify pressure sensor connected to channel 1 and the temperature probe to channel 2 Clearly label 3-125mL Erlenmeyer flasks (#1,#2,#3) RUNNING THE EXPERIMENT WITH STANDARD CaCO 3 Place flask #1 on analytical balance and press re-zero. (if flask wet, rinse with ethanol) Use a DRY spatula to transfer about 0.4 g of standard CaCO 3 into flask – record weight – tap flask so sample is to the side Fill clean vial ¾ “full” (6mL) with 4.5M HCl from common burettes – wipe any spilled acid from outside of the vial Hold the tweezers at the top. Grip the vial of acid at one edge – carefully lower vial setting it upright
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