Lab Report I

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Determining the Stoichiometry of Chemical Reactions

Mrs. Farrales Nikita Pandya
October 23, 2012
December 3, 2012

INRODUCTION

In the method of continuous variations the total number of moles of reactants is kept constant for the series of measurements. Each measurement is made with a different mole ratio of reactants. A mole ratio is ratio between the amounts in moles of any two compounds involved in a chemical reaction. Mole ratios are used as conversion factors between products and reactants in many chemistry problems.
The optimum ratio, which is the stoichiometric
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Start time: 12:15 Instant separation
End time: 12:25 Liquid still a little cloudy. Precipitate is ¾ of test tube color is light/dark orange
24 hours later: Same results 4. Start time: 12:19 Separating VERY slowly
End time: 12:29 There is no precipitate just yet. Very cloudy.
24 hours later: Same results 5. Start time: 12:22 Separation did not occur instantly
End time: 12:32 There is no precipitate just yet. Very cloudy.
24 hours later: Same results 6. Start time: 12:24 Separation did not occur instantly
End time: 12:34 There is no precipitate. Very Cloudy.
24 hours later: Same results 7. Start time: 12:27 Separation did not occur instantly
End time: 12:37 There is no precipitate just yet.
24 hours later: Same results

CuCl2 and Na3PO4

1. Start time: 12:36 Separated quickly
End time: 12:46 Precipitate ½ of test tube. Color is light blue
24 hours later: Same results 2. Start time: 12:37 Separated quickly
End time: 12:47 Precipitate is ¾ of test tube. Color is regular blue
24 hours later: Same results 3. Start time: 12:39 Separated quickly
End time: 12:49 Precipitate is ¾ of test tube. Color is regular blue.
24 hours later: Same results 4. Start time: 12:41 Separated only a little bit in the first two minutes
End time: 12:51 Precipitate is ¾ of test tube and color is light blue
24 hours later: Same results 5. Start time: 12:42 Separated only a little bit in the

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