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Shelby McLenithan Honors Chemistry 12/1/10 STOICIOMETRY LAB uncertainty= which compound hold back out stir the virtually carbonic acid gas by heating of the following: * calcium carbonate * Sodium bicarbonate * Copper (II) carbonate. shot= Calcium carbonate will produce the well-nigh carbon dioxide by heating Stoichiometry: Variables: low-level= tot of carbonic acid gas sovereign= 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 bunsen burner burner 3. think mass of CaCO3 after 5 minutes 4. envision the difference in mass between CaCO3 and CO2 5. amend 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 emission| 0| .5g| No results| Percent effects: escalate| authentic| Theoretical| Percent| CaCO3| .25| .44| 57%| CuCO3| .27| .35| 77%| NaCO3| .6| .31| 198%| zConclusion: My dead reckoning was non correct according to my results.

I had based my surmisal wrap up of the theoretical yield data we store 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 according to calc ulations. Since our pct yield for NaCO3 is s! o high, some parts of our experiment whitethorn have bygone wrong. An fault we could have made was assuming all the test tubes compressed 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 retention the heating time constant. I learned what percent yield was, and how to find theorectical yield...If you want to get a full essay, fiat it on our website: BestEssayCheap.com

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