Which of the following observations give evidence that a crystal is a hydrate? O
ID: 904643 • Letter: W
Question
Which of the following observations give evidence that a crystal is a hydrate? One or more answers may be correct.
Recalculating the percent yield of the hydrated crystals using the molecular weight of the hydrated form results in a percent yield well below 100%.
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.
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.
Adding water to crystals which have been heated results in the color returning to that of the crystals before heating.
Since the crystals were filtered from an aqueous solution, they are wet and must therefore be a hydrate.
Heating the crystal results in a decrease in mass which matches the expected mass for waters of hydration.
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.
Explanation / Answer
d ) Adding water to crystals which have been heated results in the color returning to that of the crystals before heating.
f) Heating the crystal results in a decrease in mass which matches the expected mass for waters of hydration.
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