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

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Introduction

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) ...read more.

Middle

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. Diagrams- Date- +- .02 Trial One Trial Two Mass of crucible 21.88 grams 21.88 grams Mass of crucible and Cu(II)SO4 26.97 grams 25.23 grams Mass of crucible after heated with Cu(II)SO4 25.23 grams 25.23 grams 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. ...read more.

Conclusion

Abstract- In this lab our goal was to determine the formula of the hydrate. In order to do this we had to heat the hydrate to remove all of the water from it. This required heating and massing the hydrate several times until finally the mass was consistent. Once the mass was consistent we were able to calculate how much water was in the hydrate and thus come up with a formula. Our formula ended up being Cu(II)SO4 + 4.6H2O. This was not correct but the class average was 4.96 which shows that you must experiment several times before accurately coming to any conclusions. Throughout the experiment we were able to observe the hydrate turn from crystal like blue to ash like gray. We also rehydrated the hydrate at the end to observe changes and noted that it turned blue again and grew very hot. Christina Cartagena 8/29/10 ...read more.

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