1. Calcium chloride, a deliquescent salt, is used as a desiccant in laboratory desiccators to maintain a dry environment. Explain. 2. For experimental procedure, what is the purpose of firing the crucible? 3. A 2.914 gram sample of gypsum, a hydrated salt of calcium sulfate, CaSO4, is heated at a temperature greater than 170 degrees celcius in a crucible until a constant mass is reached. The mass of the anhydrous CaSO4 salt is 2.304 gram. Calculate the percent by mass of water in the hydrated calcium sulfate salt. 4. The gravimetric analysis of this experiment is meant to be quantitative; therefore all precautions should be made to minimize errors in the analysis. a. The crucible and lid are handled exclusively with crucible tongs in the experiment. How does thic technique maintain the integrity of the analysis? b. Mass measurements of the crucible, lid, and sample are performed only at room temperature. Why is this technique necessary for a gravimetric analysis?

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Sep 13, 2020

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