ucsb - chem 1a - lab 4 discussion

ucsb - chem 1a - lab 4 discussion - The second part, after...

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Lab 4: Determination of a Chemical Formula – Discussion In this lab, we determined molecular formulas by calculating metal reactivity through acid-base titration. The objectives of the lab were fulfilled by simply adding chemical compounds to one another, and then recording observations. The first part of the lab dealt with the reaction of zinc and calcium with dilute hydrochloric acid (HCl) and water. Each element was tested twice with both the HCl and water, with the former producing more interesting results. When a lit match was brought close to the zinc in HCl, further heat was produced; the opposite was achieved with calcium. Zinc mixed with water resulted in nothing but a miniscule amount of tiny air bubbles, but calcium resulted in a gradual build-up of foam, which was determined to be basic by the addition of an indicator.
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Unformatted text preview: The second part, after the cleaning of materials, concerned itself with titration of the product of calcium in water. Hydrochloric acid was slowly added into water with calcium by way of burette; the entire solution was also being stirred by a magnetic dish and rod. By using the molarity and volume used of the HCl (.3M and .006L), the moles of hydroxide that was neutralized was calculated (.0018mol). Comparing those moles with the moles of calcium (.0012mol), it was determined that there were two hydroxide for every calcium, Ca(OH)2. There were no significant differences between the chemical formulas of both trials, so there appeared to be no errors made....
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This note was uploaded on 05/19/2008 for the course CHEM 1AL taught by Professor Hooker during the Fall '07 term at UCSB.

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