composition of hydrates - 1 Unknown B →Cobalt Choride 2...

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Abbey Blair 12/30/15 Period 5 Composition of Hydrates Safety: In this lab we wore goggles as we used a Bunsen burner and two hazardous chemicals. The chemicals used were copper (II) sulfate and cobalt (II) chloride. Copper (II) sulfate is a skin and respiratory irritant and is moderately toxic by ingestion or inhalation. Cobalt (II) chloride is a possible carcinogen as fume or dust and is moderately toxic by ingestion and causes blood damage. Procedure: Page 28 UNKNOWN LETTER: B Observations and Data: Mass of evaporating dish: 48.28g Mass of evaporating dish + hydrate: 51.37g Mass of evaporating dish + anhydrous salt: 49.25g Calculations: Calculate the mass of the hydrate used: 51.37 – 48.28 = 3.9g Calculate the mass of the water lost: 51.37 – 49.25 = 2.12g Calculate the percent of the water in the hydrate: 2.12/3.9x100 = 54.4% Questions:
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Unformatted text preview: 1. Unknown : B →Cobalt Choride 2. 54.4 – 45.44/45.44x100 = 19.72% 3. Didn’t share with a group 4. The evapora±ng dish must be cooled before measuring the mass because the heat may make it less dense and not get an accurate weight. 5. So no water from the air is absorbed. 6. Deliquescent: Tending to absorb from the air and dissolve in it EForescent: Spontaneous loss of water by a hydrated salt Hygroscopic: The ability of a substance to a²ract and hold water molecules from the surrounding environment. 7. Hydrates are prepared from the anhydrous form of the substance by adding water Conclusion: In this lab we heated an unknown substance and determined the mass of the substance and calculated the percent of the water lost. This lab furthered my understanding of the composi±on of hydrates....
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