Nahco3 Reaction Lab

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The purpose of the NaHCO3 + HCl Reaction lab was to determine what two unknown gases were, then write a balanced equation for the reaction. Fiona and I started this lab by taking an evaporating dish and a watch glass, washing them with water, then drying them with a Bunsen burner. After that, we put 3.0g of NaHCO3 in the evaporating dish and covered it with the watch glass. Then, taking a dropper bottle of HCl, we put drops of HCl by slipping the pipet underneath the watch glass. We squirted HCl on the NaHCO3 until the bubbling reaction ceased entirely. After this, the watch glass was removed and any particles on it were washed off into the evaporation dish using a wash bottle. The evaporation dish was then placed into a heating oven to dry overnight. The next lab day, we took …show more content…
When adding HCl to the NaHCO3, if the watch glass is to be raised or removed accidentally, even a sliver, more of the gas is allowed to escape than desired; thus altering the results of the lab due to there being less of the condensation on the watch glass to add to the evaporating dish. On the next lab day, after heating the dish and its contents over a Bunsen burner, when its mass was measured the results were incredibly inconsistent. Though they remained in the same range of grams, the numbers that the machine gave us were rapidly changing. In order to correct this, we repeated the heating process, but the same thing occurred: the numbers were still quickly changing, this time they were just closer to each other. I am not sure whether or not this happened to the other student groups, so I am curious: after heating the dish and its contents over the Bunsen burner and measuring it, why did the machine provide rapidly changing numbers that were in a similar range? What does spraying the condensation on the watch glass into the evaporation dish with a wash bottle do to the

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