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exp. 7 - Weights 100.08 72.8 110.88 44 18 Equation CaCO 3...

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Piper Gunderson Preparation of Calcium Chloride- Lab 7 Purpose: The purpose of this experiment is to prepare calcium chloride through a metallic carbonate decomposition reaction of calcium carbonate with dilute hydrochloric acid. CaCO 3 + 2HCl CaCl 2 +CO 2 + H 2 O Materials: Balance Bunsen Burner Ring Stand Hardware 0.5 g CaCO 3 Excess HCl dil 1- 100ml beaker (pre-weighed) Procedure: 1. Weigh the beaker 2. Obtain .5 g CaCO 3 and place it into the 100 ml beaker 3. Slowly and carefully add HCl to the CaCO3 and observe the immediate reaction. The bubbles are the Carbon dioxide being released and decomposing the carbonate. Keep adding until foaming stops. 4. Flash heat until all liquid is released and evaporated from the beaker. Observe the formation of the dry salts. 5. Stop heating when most steam has cleared 6. Determine percent yield Results: Immediate reaction: lots of foaming and bubbles. Appeared fizzy Step 4 Observation: Salt was sticking to sides of beaker as well as to the bottom. Appeared to be granulated and somewhat flakey.
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Unformatted text preview: Weights: 100.08 72.8 110.88 44 18 Equation : CaCO 3 + 2HCl -> CaCl 2 + CO 2 + H 2 O Yield: .5 g .364g .554g .22g .1 g Percent Yield: Actual/ theoretical x 100% 54.22- 53.65/ .55= .57/ .55= 104% yield Diagrams: http://en.wikipedia.org/CaCO3 http://www.o-digital.com/wholesale-products/2179/2187-4/Coaxial-Connector-3-72660.html http://vygotsky.ced.appstate.edu/barrier/crucible.htm Safety Information: Be cautious of the HCl. It can be corrosive to skin. Also be cautious of the fire with the Bunsen burner. It can catch hair on fire and can also provide a burning hazard. Conclusion: In this reaction we were able to successfully complete the hypothesis. We created the CaCl2 with a 104% yield, which was very good. We also were able to see the water leaving as steam as shown in the equation. This was very interesting to observe because in many other equations and experiments, you are not able to watch the actual reaction take place....
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exp. 7 - Weights 100.08 72.8 110.88 44 18 Equation CaCO 3...

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