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Exam (elaborations)

CHEM 103 Lab Exam 3 – Portage Learning

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CHEM 103 Lab Exam 3 – Portage Learning. Why was the crucible cooled in a desiccator? 2. With what was the sample coated in the SEM experiment? 1. The crucible cooled in a desiccator to prevent water from being picked up. 2. The sample was coated with carbon in the SEM experiment. Answer the following question. A 1.1000 gram hydrate sample chosen from Na2CO3∙10H2O, AlCl3∙6H2O, MgCl2∙6H2O and BaCl2∙2H2O was heated and found to lose 0.5841 gram of H2O. (1) Show the calculation of the % H2O in the unknown hydrate sample. (2) Show the calculation of the % H2O in each of the hydrate compounds and identify the unknown hydrate from the list. Atomic weights: H = 1

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