A Train Lab

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Taking the A train Chemistry Lab 106 Lab Report: Taking the A train Experimental Procedure/Observation for Part I In this experiment our objective was to determine why we used acidified water when we reacted zinc with iodine. We began by weighing an empty boiling tube which was 40.99 grams. Next we added two grams of granular zinc to the aforementioned boiling tube. Then, we added two grams of iodine to the boiling tube already containing the zinc. After that we added 4.99 mL of deionized water to the boiling tube and began swirling the substances until the reaction was completed. There was a slight discoloration in the water, the tube became a “contaminated color” of water and dust. Next we added 2.8 mL of deionized water and mixed by swirling again. Still no tangible precipitate had formed so we continued adding deionized water in 5 mL increments. We did this twice adding 5 mL at a time until we observed a web like substance appear in the tube. This substance was identified as the precipitate, so we continued to the next step. # of mL of deionized water added | Observation | 4.99 | Slight discoloration; no clear precipitate present | 2.80 | Some substance appearing in test tube, nothing clear | 5.00 | Water turning into a contaminated state | 5.00 | Web like substance observed in test tube; precipitate observed | After obtaining a precipitate, we divided the solution in two small test tubes, while retaining the zinc in the boiling tube. We then centrifuged the test tubes for about one minute in order to separate the precipitate and the supernatant. We observed that the test tubes had two substances in it, at the bottom was a “milky-white” section that was the precipitate. The rest of the tube was a clear liquid that was determined to be the excess supernatant. Next, we discarded the supernatant in a waste

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