Taking the a Train Lab Report Essay

657 WordsMay 15, 20133 Pages
Taking the A Train Chem 106 Section 12 1. Introduction: This lab focused on showing the reaction that takes place between zinc and iodine using only deionized water instead of acetic acid (or vinegar) as we did in the previous lab by adding acetic acid to zinc iodide. The purpose of this lab was to see how water created the reaction and another compound or precipitate. Focus Question: Zn(OH)2 was the product when zinc and iodine were reacted without the presence of acetic acid in the water. Confidence Report: I am confident that our data in the experiment was “good data”. We had the expected positive results occur from the identification experiments. We made sure to measure everything correctly. We correctly identified the…show more content…
The chemical equation of the formation of zinc hydroxide after zinc and iodine react: 2Zn+I2+2H2O2Zn(OH)2+I2 2. When zinc hydroxide and acetic acid are reacted, the zinc hydroxide dissolves and a clear liquid is formed which contains zinc acetate and water. Because zinc hydroxide is amphoteric, it can either give or receive a proton. When zinc hydroxide reacts with acetic acid, the reaction yields zinc acetate and water. The reaction is as follows: Zn(OH)2 + 2CH3COOHZn(CH3COO) 2 + 2H2O 3. What is a side reaction? A side reaction is an unwanted chemical reaction that diminishes the yield of the desired product. 4. Acetic acid was used in the synthesis of zinc iodide because an addition of a weak acid prevents the formation of Zn(OH)2 that occurs when zinc and iodine react with deionized water. The formation of the precipitate inhibits the production of the product ZnI2 and may make it seem as if the basic law of conservation of mass was not obeyed. Since acetic acid and water are both volatile, they can both be easily removed from the solution by heating which would possibly leave behind more ZnI2 . When the acid is not added, it is interesting to observe the Zn(OH)2 precipitate that is formed. A New Inquiry: What if we had heated this precipitate too like in the last experiment to remove all H2O from it? Would the heating
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