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chemistry
march 2020
19

Chemistry Questions and Answers March 19, 2020

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Calcium chloride, a deliquescent salt, is used as a desiccant in laboratory desiccators to maintain a dry environment. Explain

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 this technique maintain the integrity of the analysis b. Mass measurements of the crucible, lid, and

a. What is the percent by mass of water in iron(II) sulfate heptahydrate, FeSO 4 7H 2 O (or what percent of the molar mass of FeSO 4 7H 2 O as due to the waters of crystallization)? b. What mass due to waters of crystallization is present in a 3.38-g sample of FeSO 4 7H 2 O?

What is the purpose of firing the crucible?

A 1.803-g sample of gypsum, a hydrated salt of calcium sulfate, CaSO4, is heated at a temperature greater than 170C in a crucible until a constant mass is reached. The mass of the anhydrous CaSO4 salt is 1.426 g. Calculate the percent by mass of water in the hydrated calcium sulfate salt.

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