AP Chemistry - Semester 1 : Stoichiometry of Formulas and Equations

Sections: Introduction   |  Section 1   |  Section 2   |  Section 3   |   Lab

Labs: Water within a Hydrate   |  Stoichiometry   |  Precipitation of Chalk

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Lab Assignment: Water within a Hydrate Pre-Lab Questions To be sure you are ready to begin the lab, read the following questions.  Then click on the answer to check your understanding. 1. What is the process that is occurring when you heat a sample of a hydrated salt? The loosely bound water molecules are being removed to leave an anhydrous salt. 2. How can you determine the formula mass of the anhydrous salt? Adding the mass of the elements in the formula making sure you add the total number. 3. How do you find the number of moles of water present? Use the mass of water driven off divided by the molar mass of water, 18.01 g/mol. 4. How can you determine the number of moles of water per mole of salt? Take the number of moles of water divided by the number of moles of salt. Next page

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