Chem Lam

CHEMISTRY

September 25, 2010

Experiment #5: Percentage of weewee in a Hydrate

Summary of Principles
In this lab, students ordain calculate the do of water in an unknown provide. A hydrate is a compound with a specific number of water molecules associated with the ions of that compound. A hydrate may form when an anhydrous compound is undetermined to atmospheric water or when the ionic compound is glace from an aqueous solution. An anhydrous compound is a substance without water. thither are two parts to this lab. Part 1 which will be a known hydrate CoCl2 ?6H2O or carbon monoxide (II) Chloride hexahydrate, and Part 2 which will be an unknown hydrate.




Equations and Mechanisms
* Moles of hydrate and water ratio:
Moles of water
Moles of hydrate
* Mass percent water in hydrate = Weight loss during heating × 100%
master copy mass of hydrate
* Percent by mass of water in the unknown hydrate:
Moles of water (g) × 100
Moles of unknown hydrate (g)

tool and Supplies
Balance
Two melting pots and lids
Hot plate
Cobalt (II) chloride hexahydrate (CoCl2?6H2O)
Tongs
An unknown hydrate
tabularise of Chemicals and Physical Properties
Name of Chemical| Molecular Formula| hero Mass| Appearance|
Cobalt (II) chloride hexahydrate| CoCl2?6H2O| 147.746g/mol| Pinkish/ exit crystals|
An unknown hydrate (Copper Sulfate pentahydrate)| CuSO4?5H2O| 181.113 g/mol| sullen powder|

Outline of Experimental Procedure
Part 1
1) Weigh crucible without hydrate before heating
2) Record data
3) Weigh crucible without hydrate after heating
4) Record data
5) Add CoCl2?6H2O to crucible
6) Weigh it
7) Place crucible on hot plate
8) Record the color change
9) Weigh crucible after heating
10) Find mass and moles of hydrate
11) Find mass and moles of water eliminated
12) Find mole ratio of water to hydrate
Part 2
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