The hypothesis was that unknown was calcium chloride. This conclusion came from a couple of sources of reasoning. First, a number of compounds were present in the lab, and one of those had to be the unknown. Second, the unknown was white and spherical in shape, and so these characteristics were examined for in the possible compounds. Compounds that were sand-like in texture or liquid in their present physical state were passed over since none of those compounds could be the unknown. Calcium chloride physically represented the unknown--not only in the color, but also in shape and size. Before performing tests on calcium chloride, all tests were done on the unknown (solubility, flame, ion, conductivity, and pH). With the ion test, it was decided
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Stoichiometry equations of calculating the mass of calcium carbonate and magnesium chloride needed to produce one gram of calcium chloride.
The required masses were carefully measured on a scale, and then added to a beaker containing 30 mL of distilled water. When an aqueous solution was made, the solution was poured through a funnel in order to separate the precipitate and the liquid. A possible error that could have transpired during this step is that some of the precipitate may have bypassed the filter in the funnel, and made it into the beaker of aqueous calcium chloride. A way to prevent this from occurring is to create another filter using the specified filter paper and having the solution run through the funnel …show more content…
A misstep that would result in an erroneous outcome is leaving the aqueous calcium chloride for too long on the hot plate. Leaving the beaker on the hot plate will alter the solid mass obtained of calcium chloride. This human error was most likely the cause of only resulting in 0.469 g of calcium chloride. What can be done to prevent this is to conduct a few trials using a timer to discover the optimum period of time the beaker of solution should be on the hot plate. The synthesis was conducted again for a second trial due to the large discrepancy between the theoretical mass and the actual mass of calcium chloride (Scheme
Stoichiometry equations of calculating the mass of calcium carbonate and magnesium chloride needed to produce one gram of calcium chloride.
The required masses were carefully measured on a scale, and then added to a beaker containing 30 mL of distilled water. When an aqueous solution was made, the solution was poured through a funnel in order to separate the precipitate and the liquid. A possible error that could have transpired during this step is that some of the precipitate may have bypassed the filter in the funnel, and made it into the beaker of aqueous calcium chloride. A way to prevent this from occurring is to create another filter using the specified filter paper and having the solution run through the funnel …show more content…
A misstep that would result in an erroneous outcome is leaving the aqueous calcium chloride for too long on the hot plate. Leaving the beaker on the hot plate will alter the solid mass obtained of calcium chloride. This human error was most likely the cause of only resulting in 0.469 g of calcium chloride. What can be done to prevent this is to conduct a few trials using a timer to discover the optimum period of time the beaker of solution should be on the hot plate. The synthesis was conducted again for a second trial due to the large discrepancy between the theoretical mass and the actual mass of calcium chloride (Scheme