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Shelby McLenithan Honors Chemistry 12/1/10 STOICIOMETRY LAB hesitation= which compound hold back out stir the close carbonic acid gas by heating of the avocation: * calcium carbonate * Sodium bicarbonate * Copper (II) carbonate. possibility= Calcium carbonate will produce the roughly carbonic acid gas by heating Stoichiometry: Variables: low-level= tot of carbonic acid gas indie= the reactants control= amount of reaction, same amount of heating ( 5 minutes) Procedure: 1. Measure out 1 gram of CO2 2. Heat CaCO3 for 5 minutes using th etna burner 3. think mass of CaCO3 after 5 minutes 4. finger the difference in mass between CaCO3 and CO2 5. recur 1-4 for NaHCO3 6. Repeat 1-4 for CuCO3 Results: | 1st run| 2nd trial| tertiary trial | CuCO3| 17.85| 17.8| 17.84| CO2 emission| .25g| .3g| .26g| NaHCO3| 17.35| 17.5| 17.65| CO2 emission| .6g| .75g| 4.5| CaCO3| 18.1| 18.05| No results| CO2 emiss ion| 0| .5g| No results| Percent translates: flux| authentic| Theoretical| Percent| CaCO3| .25| .44| 57%| CuCO3| .27| .35| 77%| NaCO3| .6| .31| 198%| zConclusion: My conjecture was non correct according to my results.

I had based my supposal wrap up of the theoretical yield data we poised after doing a few stoichiometry equations. The actual riddles we performed proved that NaHCO3 produced the most CO2 by heating and CaCO3 produced the least. Percent yield is a measure of how oftentimes of a product you actually obtained in a reaction compared to the amount that you could have obtained accordin g to calculations. Since our percentage yie! ld for NaCO3 is so high, some parts of our experiment whitethorn have bygone wrong. An fault we could have made was assume all the test tubes reflected the same, and next time we should properly weigh them. Another error we could have made could be not measuring the compounds right on or not retentiveness the heating time constant. I learned what percent yield was, and how to find theorectical yield...If you want to get a full essay, arrangement it on our website: BestEssayCheap.com

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