In part 1 of this experiment we observed what happened when various elements were reacted with eithe

In part 1 of this experiment we observed what happened when various elements were reacted with eithe

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In part 1 of this experiment we observed what happened when various elements were reacted with either HCl or water. First we added zinc to 6M HCl and observed that this solution bubbled and a small pop was heard when a match was lit over the test tube. Heat was absorbed in this reaction. Next we added calcium to .02M HCl and observed that there was bubbling but nothing happened when a match was lit over the test tube. Heat was produced in this reaction. Then we added zinc to water and observed that nothing happened. Finally we added calcium to water and observed that there was popping and the solution turned cloudy and white. When phenolphthalein was added the solution turned half white and half pink. Possible sources of error were that the calcium was allowed to oxidize in the air and that substances were incorrectly measured.
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Unformatted text preview: In part 2 of this experiment we did the titration of the product of the reaction of calcium in water. We did this in order to determine the molecular formula of calcium hydroxide through experimentation. We did this by doing two trials of the same experiment in which we added calcium and .1% thymol blue indicator to water then added .30M HCl until the solution turned yellow to indicate an acidic solution. We then used the data to determine moles of OH and calcium used then used this to find the ratio between the two and determine the experimental molecular formula. Possible sources of error could have arisen from the calcium having oxidized, having added too much or too little of the HCl acid, and from having taken incorrect measurements....
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This note was uploaded on 03/14/2010 for the course CHEM 109A 109A taught by Professor Aue during the Spring '09 term at UCSB.

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