Lab #2 Water Hydration of Copper(II) Sulfate. Purpose- To determine the formula of the hydrate from the anhydrous compound.

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Lab #2 Water Hydration of Copper(II) Sulfate

Purpose- To determine the formula of the hydrate from the anhydrous compound.

Materials-

Triple beam balance

Gas Burner

Crucible and cover

Iron ring and stand

Spatula

Crucible tongs

Clay triangle

Wire gauze

Copper(II) sulfate, hydrated crystals, 5g

Distilled water

Variables-

Independent- Temperature, amount of time heated

Dependent- Mass of the crucible with Cu(II) SO4

Control- Crucible

Procedure-

  1. Set up the iron ring stand with the clay triangle and gas burner below it.
  2. Place the crucible with the cover slightly tipped on the clay triangle so that gas can escape.
  3. Heat the crucible for about five minutes to fully sanitize it.
  4. Stop heating and remove the crucible from the clay triangle onto the wire gauze and allow it to cool for about five minutes.
  5. Place the crucible on the balance to find its mass. Record this data.
  6. Add the copper (II) sulfate into the crucible using the spatula.
  7. Place the crucible with the hydrate onto the clay triangle and begin to heat it for about five minutes. Record any observations.
  8. Remove the crucible and transfer it to the wire gauze so that it can cool for two minutes.
  9. After it has finished cooling place it on the balance and record the mass.
  10. Place the crucible back onto the clay triangle and heat again for five minutes.
  11. Remove the crucible with tongs and let it cool for two minutes.
  12. Check the mass and if it is the same as the first time you are done. If not, repeat the heating, cooling, and massing until it is consistent.
  13.  Add a few drops of water and record any observations.
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Diagrams-

Date-

             +- .02                      Trial One                     Trial Two

Observations-

Cu(II)SO4 was an aqua blue before being heated and looked like mini crystals

Once the Cu(II)SO4 was heated it turned white and had an ashy looking texture

Once the Cu(II)SO4 has rehydrated it turned aqua blue and crystal looking again as well as very hot.

Calculations-

1.75 g of H2O x 1 mol H2O/18.01 g H2O = .097 mol of ...

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