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# Formula of a Hydrate Lab. By performing this lab, we will be able to find the molar amount of water in the compounds magnesium sulfate and copper sulfate.

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Introduction

Patty Lopez Hacker 6th Period Formula of a Hydrate Lab Lab Members: Patty Lopez, Gaby Calderon, Magali Garcia Dates the lab was performed: November 4th and 5th Purpose: * By performing this lab, we will be able to find the molar amount of water in the compounds magnesium sulfate and copper sulfate. By heating the compound, the heat will evaporate the waters of hydration, which will allow us to find the formula of the unknown hydrated salts. Hypothesis: * If we heat the hydrated salts, then the hydrates will evaporate and we will be able to find the formula of the hydrated salts. Materials: * 1 ring stand * 1 ring * Crucible tongs * Crucible and cover * Clay triangle * Small dropper * Bunsen burner * Matches * Lab balance * Watch glass * ~1g. ...read more.

Middle

7. Cool and determine the mass of the crucible, cover and its contents. 8. This last mass should agree with the previous mass within plus or minus0.01 grams. Note: if it does not, repeat this heating until a constant mass is reached. This is called heating a constant mass and is the only way of insuring that the reaction is complete and all the waters of hydration have been driven off (dehydrated). Do not heat the crucible to red hot, or the salt's sulfate portion will start to break down. This will give you yellowish contents. If this happens, you have to start over! Results: Copper Sulfate Mass Observations Crucible, cover and paper clip 17.8g. Crucible, cover, paper clip, and hydrated salt 19.8g. ...read more.

Conclusion

of MgSO4 1.0g.H2O x 1 mol =.056 mol H2O 18.0g. 1.0g. MgSO4 x 1mol = .0083 mol MgSO4 120.4g. .056 = 7 .0083 .0083 =1 .0083 Formula: MgSO4 x 7H2O Conclusion: In the Formula of a Hydrate Lab, our hypothesis was correct. When we heated the hydrated salts, the hydrates evaporated and we were able to find the formula of the salts. When we heated the compounds, we got a formula of CuSO4 x 6H2O for the copper sulfate, and MgSO4 x 7H2O for the magnesium sulfate. Our copper sulfate formula was very close to the answer of CuSO4 x 5H2O, but by heating the hydrate for another minute, or removing the crucible cover for a minute longer, we would have achieved that number by allowing the hydrate to evaporate the other waters of hydration. Although we don't know the correct answer for the magnesium sulfate, MgSO4 x 7H2O was our best guess. ...read more.

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