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CH 105L Exp. 5 Post Lab

CH 105L Exp. 5 Post Lab - Name Aamani Chava Skidmore...

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Name: Aamani Chava Date: October 14, 2007 CH 105L/Section # 002 Instructor: Prof. McCluan Directions : Type in answers below each question, using complete sentences. Use 1.5 spacing in your answers. Avoid first person, and use passive voice. (100 points total) 1. In approximately three paragraphs, describe the procedure you followed in enough detail so that another student could reproduce what was done. (20 points) The objective of this experiment was to recover the mass of the carbon dioxide emitted from the reaction between sodium carbonate and HCl and sodium bicarbonate and HCl. Two 400-mL beakers were massed and labeled “Run 1” and “Run 2.” 1.154 g ( ± 0.001g) of NaHCO 3 was massed on weighing paper and set aside. 25.0 mL of 1.0M HCL was measured in a 100 mL graduated cylinder and added to the “Run 1” beaker and massed. The solid NaHCO 3 was then added to the “Run 1” beaker and the reaction was observed carefully. The beaker with the solution of NaHCO 3 and the HCl was then swirled gently to rid it of any bubbles and the massed. This reaction was repeated in the “Run 2” beaker with similar measurements and clean, dry equipment. The second procedure was very similar to the first one but it was done with a different solid substance. Two 400mL beakers were massed and labeled “Run 1” and “Run 2.” 1.205 ( ± 0.001g) of Na 2 CO 3 was massed on weighing paper and set aside. 35.0 mL of 1.0M HCl was measured in a 100 mL graduated cylinder and added to the “Run 1” beaker and massed. The solid Na 2 CO 3 was then also added to the “Run 1” beaker and the reaction was observed carefully. The beaker with the solution of Na 2 CO 3 and the HCl was then swirled gently to rid it of any bubbles and the mass was recorded. This reaction was repeated in the “Run 2” beaker with clean, dry equipment with varying measurements (i.e. mass of the Na 2 CO 3 solid) 2. Construct two tables. Table 1 should neatly summarize all information required on p. 42 (Question #3 a- h) and p. 44 (Question #1 all bulleted items) of the lab manual for the reaction of sodium bicarbonate (NaHCO 3 ) with hydrochloric acid. Table 2 should do the same for sodium carbonate (Na 2 CO 3 ). Incorporate the changes discussed in laboratory, and include a specific title, units, ± errors, and the appropriate number of significant figures.
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