Submitted by: Submitted by bullet
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Words: 1135
Pages: 5
Category: Science and Technology
Date Submitted: 11/30/2010 08:34 PM
Products and Reactants
10-12-2010
Key Question: How does the amount of product you make change as you change the amount of reactant used?
H2SO4 (aq) + BaCl2 (aq) 2HCl (aq) + BaSO4(s)
Beginning Ideas:
Since barium sulfate is insoluble it will become a solid according to the solubility rules. The amount of barium sulfate will increase until equilibrium, which is 15 mL of barium chloride and 5 mL of sulfuric acid. After this equilibrium, the amount of theoretical mass created from the reaction will not increase. The group can also figure out the limiting reactant, which is what makes the least amount of product but it doesn’t matter how much you start with. It matters how much you get out of the reaction. The theoretical yield cannot be less than what the group actually makes because that would create an error. If a group were to create more product than the theoretical yield, the most likely error would that they had excess water that weighed down the product.
Tests:
The group used a pipette to measure 5 mL of sulfuric acid and 15 mL of barium chloride and placed them into to two different Erlenmeyer’s and heated them to a near boil. After heating both reactants to a near boil, the group then mixed the two reactants together while slowly stirring the solution. The group then heated the solution for another 15 minutes. After heating the solution, the group then let the solution cool to room temperature. Once the solution has been cooled, the group poured the solution through the vacuum filtration to separate the barium sulfate from the solution. The group then weighed the barium sulfate and compared that to the theoretical yield to see how accurate the experiment was.
Observations:
The two reactants didn’t take long to reach the necessary heat to boil. But it seemed that the sulfuric acid boiled faster than the barium sulfate. When the group mixed the two reactants together I didn’t take long before barium sulfate was created and started to...