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Lab # 3 Determining the Empirical Formula for a Compound

Lab # 3 Determining the Empirical Formula for a Compound -...

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Matthew Li CHE1111L-0 September 26, 2011 Experiment 3: Post-Lab Questions 1. Write the balanced chemical reaction for this experiment. Mg (s) + 2HCl (aq) --> MgCl 2(aq) + H 2(g) 2. Why is it important to add the 1 M HCL drop wise to the crucible? You add the HCL drop wise into the crucible because it is a very concentrated solution, and adding it drop wise will limit the contact with reactants, slowing the reaction down adding overall control to the process. 3. Why are you advised to not heat the dry solid too much? You are supposed to moderately heat the dry solid because MgO is being produced. The metal will start to decompose, giving you a false reading, one that weighs less than it actually should. 4. If the identity of the metal used was not revealed to you, could you use the data in this
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Unformatted text preview: problem to determine which metal was used? Yes, using a variety of information from the experiment, I could use the data in this problem to determine which metal was used. You could set up a proportion and find the metal that is equivalent to 0.040 g if it forms a 1:2 ratio with Chlorine with a mass of .149. Looking at the periodic table, Mg is the answer. 5. List all the steps in this experiment and estimate the time it took for each step. Cleaning crucible 3 minutes Cooling 15 minutes Weighing crucible + metal - 2 minutes Transferring HCl 5 minutes Mg dissolving 10 minutes Heating crucible 15 minutes Cooling 15 minutes...
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