lab report

# lab report - 0.154g to 0.082 g b Mole ratio of Mg to O c...

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Name: _Sumaya Mahmood_____________ CHM 1045C Laboratory Report #4 15 points Due Feb 5, 2011 Experiment #8: limiting Reactant Parts A: Precipitation of Ca Trial 1 Trial 2 1. Mass of crucible and lid (g) 22.244 g 22.793 2.Mass of fired crucible, lid and sample (g) 22.398 g 22.950 g 3.Mass of sample (g) 0.154 g 0.157 g 4. Instructor’s Approval Yes Yes 5. Mass of crucible, lid, and product (g) 1 st mass measurement (g) 22.480 g 23.035 g 2 nd mass measurement (g) 22.478 g 23.034 g 3 rd mass measurement (g) 22.480 g 23.034 g 6. Final Mass of crucible, lid and product (g) 22.480 g 23.034 g 7. Mass of product (g) 0.236 g 0.241 g 8. Combination reaction of Magnesium and Oxygen a. Mass ratio of Mg to O

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Unformatted text preview: 0.154g to 0.082 g b. Mole ratio of Mg to O c. Empirical formula of magnesium oxide d. Percent by mass of magnesium e. Percent by mass of oxygen Write a balanced chemical equation for the reaction that took occurred. Laboratory Question (1) 1. The crucible is not fired, as the procedure suggests, but hsf retained some impurities from previous use. The mass of the “dirty” crucible is recorded. However, the impurities are burned off in the experiment. Will the reported mass of the final product be too high, too low, or unchanged as a result of this technique error? Explain....
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