CHEM 111 Chapter Notes - Chapter 8: Limiting Reagent, Chemical Formula, Chemical Equation
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Which of the following observations give evidence that a crystal is a hydrate? One or more answers may be correct.
a. | Recalculating the percent yield of the hydrated crystals using the molecular weight of the hydrated form results in a percent yield well below 100%. | |
b. | The number of water molecules in the hydrated crystals is calculated from the mass lost on heating. This matches the expected number based on a google search. | |
c. | On heating the crystals in a test tube over a bunsen burner, a clear liquid is noticed near the top edge of the test tube. | |
d. | Adding water to crystals which have been heated results in the color returning to that of the crystals before heating. | |
e. | Since the crystals were filtered from an aqueous solution, they are wet and must therefore be a hydrate. | |
f. | Heating the crystal results in a decrease in mass which matches the expected mass for waters of hydration. |