chem 1A disc determ of chem form

chem 1A disc determ of chem form - Part two of this...

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Janice Oldham Chem Lab W-1pm Dennis 7 November 2007 Discussion: Determination of a Chemical Formula In part one of this lab, we tested the reactions of zinc and calcium, with hydrochloric acid and water. We placed a small amount of hydrochloric acid in a test tube and added mossy zinc. We found that a reaction occurred when the zinc was in the acid. When a match was placed over the top of the test tube, a small popping noise could be heard and the match was blown out by the reaction. Calcium had slightly different results. When the match was placed over the test tube, instead of being blown out, a larger flame was produced. We also tested calcium and zinc with deionized water. When the zinc was placed in the water, no reaction occurred. However when calcium was added there was a much larger reaction, and the phenolphthalein turned pink, indicating it was a basic solution. Seen in this balanced equation: Ca + 2H2O> Ca(OH)2 + H2
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Unformatted text preview: Part two of this experiment involved acid-base titration. The purpose was to determine the chemical formula of calcium hydroxide. We placed two different samples of calcium to attain more accurate results. Hydrochloric acid was placed in a burette and added to a solution of DI water, calcium, and thymol blue. We titrated the HCl into this solution until it turned yellow, indicating that it had changed from a base to an acid. The balanced equation for this reaction is: Ca(OH)2+ 2HCl > CaCl2 + 2H2O. There are multiple sources of error that could have affected the results of this experiment. If there was still some calcium metal left in the reaction with water, it would decrease the amount of Ca(OH)2, and more HCl would have to be added. The molarity of HCl could also be slightly off, and affect the number of moles of H+ we calculated....
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chem 1A disc determ of chem form - Part two of this...

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