9.4 Dehydration of Hydrates -Data Sheet Date: Name: Instructor: Section/Group Un

Question

9.4 Dehydration of Hydrates -Data Sheet Date: Name: Instructor: Section/Group Unknown Hydrate Code Initial observations of your unknown Initial mass crucible +lid Initial mass crucible +lid+ unknown 1st heating: mass crucible +lid + unknown 2nd heating: mass crucible + lid+ unknown 3rd heating: mass crucible+ lid+ unknown 4th heating: mass crucible+ lid + unknown 5th heating: mass crucible +lid + unknown 6th heating: mass crucible+lid + unknown Final mass of unknown Mass % water in unknown Final mass of unknown

Explanation / Answer

Mass of crucible+lid = 36.267 g

Mass of crucible+lid+unknown = 37.831 g

Mass of unknown = 37.831-36.267 = 1.567 g

Mass of crucible+lid+unknown after 1st heating = 37.036 g

Mass of unknown after 1st heating = 37.831-37.036 = 0.795 g

Mass of water lost after 1st heating = 1.567-0.795 = 0.772 g

Mass of crucible+lid+unknown after 2nd heating = 37.034 g

Mass of unknown after 2nd heating = 37.831- 37.034 = 0.797 g

Mass of water lost after 2nd heating = 1.567-0.797 = 0.770 g

Mass percent water in unknown = (mass of water lost /mass of hydrate ) x 100 = (0.770/1.567)x100 = 49.14%

Final mass of unknown = 0.797 g

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