Lab Report On Characteristics Of Hydrates

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drates
Name: Anna Dais
Partner’s Name: Avery Anderson
Thursday 3:10-6pm 9/7/17
CHMY 141-218
TA: Mackenzie Lynes

Introduction The purpose of this lab was to explore the characteristics of hydrates. Hydrates are solid ionic compounds that contain water that is chemically bound to the crystal. In doing this lab, the percentage of water contained in various hydrates, if dehydration is a reversible or irreversible change, and the mathematical relationship between starting mass and mass lost. As there is no simple way to predict the amount of water molecules in a hydrated compound, it must be determined by experimenting. This experiment involves heating said hydrates so the water molecules evaporated from the solid compound. In the different
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While the sample is cooling, record any observations made in notebook. Once the crucible is cooled, record the mass of crucible and substance together. Repeat process with a different mass of beginning substance.

Part Three: Repeat the experiment from part one using Epsom salt. Record observations in notebook.

Observations and Data:
Part One:
Table 1:
Substance
Before Heat
During-After Heat
After Rehydration
Hydrated Copper Sulfate
Blue, powdery, grainy, crystal like
Became a darker blue, then turned to white, remained grainy, no longer crystal like.
After adding water, goes back to the original observed state
Hydrated Ferrous Sulfate
Greenish tan, grainy
Turned lighter tan. Looks dry and sand like
Turned milky brown
Hydrated Cobalt Sulfate
Fuchsia, large chunks/ crystals
Turned dark blue to light purple to baby blue powder consistency while expanding
Turned back to dark blue liquid, within a few minutes turned to solid and fuchsia
Sugar
White, Grainy, crystalized
Melted to a clear liquid, turned yellow to brown emitting strong sweet smell
Stayed melted, mixed in with the water added
Table 2:
Reversible
Irreversible
Hydrated copper sulfate
Hydrated cobalt sulfate
Sugar
Hydrated Ferrous Sulfate

Part Two:
Table 3:
Subject
Sample 1
Sample 2
Peer Sample 1
Peer Sample 2
Peer Sample 3
Crucible and sample before heat

27.48g

29.04g

29.92g

29.09g

30.098g
Crucible before heat
26.045g
26.045g
28.9g
27.65g
29.08g
Sample before heat
1.635g
2.995g
1.02g
1.44g
1.02g

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