CuSO4 · 5H2O: Mass of crucible and lid (42.76g), mass of crucible, lid, and compound (44.05g), mass after the first heating (43.58g), mass after the second heating (43.59g), mass after the third heating (43.58g). Data Analysis:
1. Why was it essential to heat the sample a minimum of two times? Be specific – why not a minimum of three times?
2. Calculate the mass and moles of the anhydrous compound in your sample.
3. Calculate the mass and moles of water in your sample.
4. Calculate the percent by mass of water in your compound.
5. What is the proper chemical formula and name for the hydrated compound that you tested? Explain how you determined the water of hydration ("n") for your chemical formula.
6. What is the molar mass of your compound?
7. If you had not heated the sample long enough to remove all the water of hydration, would your calculated "n" be higher or lower than it should be? Explain.