lab 4 - Part II For part II we added calcium to water then...

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Elizabeth Farrington Experiment #4 Discussion Introduction: The lab is about acid-base titration and molecular formulas of compounds. The purpose is to observe metal reacting with water and metals reacting with acid. Part I For part I we added 2ml of 6M HCl to zinc, 2Zn+2HCl→H 2 +2ZnCl put our thumbs over the test tube, and then lit the hydrogen gas to produce a pop. Then we did the same thing for .02M HCl and calcium Ca + +HCl→H 2 +CaCl 2 . The calcium and HCl reacted as vigorously as the zinc and HCl; this tells me that calcium is more reactive than zinc. I expected calcium to react more than zinc with water, this was true. The zinc did not react at all with water.
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Unformatted text preview: Part II For part II we added calcium to water then titrated it by adding HCl. Ca + +H 2 OCa(OH) 2 +H 2 Ca(OH) 2 +2HClCaCl 2 +H 2 O. From the change in volume of the HCl we found the molarity of hydrogen and then the moles. The mole ratio of OH- to Ca (1.9:1) lead to the chemical formula. Ca(OH) 2 We learned how to find the molecular formula of Ca(OH) 2 by titrating. Possible sources of error in part II could be if we began the titration before all the calcium had reacted with the water. We would have then mixed HCl with Ca, forming hydrogen gas, and making our volume necessary to neutralize lower....
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This note was uploaded on 05/03/2008 for the course CHEM 1AL taught by Professor Hooker during the Spring '07 term at UCSB.

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lab 4 - Part II For part II we added calcium to water then...

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