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Formula Of A Hydrate Lab Report

601 Words3 Pages

Kendrell Goodwin
Formula of a hydrate

Objective/hypothesis
The objective of this lab is to calculate the number of moles of the anhydrous salt and the moles of water driven off. The purpose of this lab is to determine the formula of the hydrated salt. The outcome expected in this lab is that the

Procedure
Get a porcelain crucible and cleanse with soap then rinse with tap water. Follow up after rinsing with tap water, with rinsing with distilled water. Place the crucible on the iron ring of the triangle assembly. To insure all water is removed, heat the crucible for no less than 10 minutes. After all the water is removed let the crucible cool down on the assembly. Make sure to turn off the burner. After the crucible has cool, weight it and …show more content…

(28.54g-24.21g). we found the mass of the anhydrous salt to be 2.57g by subtracting the mass of the crucible + salt by the mass of the crucible after heating, (26.78g-24.21g). we found the moles of anhydrous salt to be .016 by dividing the mass of the anhydrous salt by the molar mass of the anhydrous salt, (2.57g/158.53 g/mol). To find the mass of H20 driven off we subtracted the mass of hydrated salt by the mass of anhydrous salt, (4.33g-2.57g=1.76g) Then we calculated the moles of H20 driven off to be .098mol by dividing the mass of H2O driven off by 18, (1.76g/18). We found the moles of H20/ Moles of anhydrous salt to be 6.125.

Conclusion
The result we got for this lab was that the formula of hydrate salt was 6H20NiSO4. We found that for every mole of anhydrous salt there was 6 moles of water. We divided the moles of H20 to the moles of anhydrous salt to find the ratio.
Pre-lab questions
1. The two things that make up hydrates is water and constituent elements.
2. You can determine this by calculating the mass and moles of H20 driven off.
3. The formula is

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