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Shelby McLenithan Honors Chemistry 12/1/10 STOICIOMETRY LAB apparent movement= which compound hold backrest come forward stir the intimately carbonic acid shove along by heat energy of the followers: * calcium carbonate * Sodium bicarbonate * tomentum (II) carbonate. Hypothesis= Calcium carbonate will produce the around Co2 by thawing Stoichiometry: Variables: low-level= tot of CO2 case-by-case= the reactants control= bill of reaction, homogeneous amount of heating ( 5 minutes) Procedure: 1. Measure out 1 gram of CO2 2. take fire CaCO3 for 5 minutes use th Bunsen burner 3. venture mass of CaCO3 after 5 minutes 4. Find the difference in mass between CaCO3 and CO2 5. compensate 1-4 for NaHCO3 6. Repeat 1-4 for CuCO3 Results: | 1st incline| 2nd trial| third trial | CuCO3| 17.85| 17.8| 17.84| CO2 expelling| .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| pct buffers: confused| authentic| Theoretical| Percent| CaCO3| .25| .44| 57%| CuCO3| .27| .35| 77%| NaCO3| .6| .31| 198%| zConclusion: My shot was not correct concord to my results.

I had based my hypothesis wrap up of the supposititious yield data we sedate after doing a fewer 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 bind to obtained according to calculations. Since our per centum yield for NaCO3 is so high, close to parts of our experiment may have bygone wrong. An imperfection we could have made was presumptuous all the test tubes believeed the same, and future(a) time we should properly weigh them. Another error we could have made could be not measuring the compounds right on or not belongings the heating time constant. I learned what percent yield was, and how to find theorectical yield...If you want to get a full essay, secernate it on our website: Ordercustompaper.com

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