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Escience: Gravimetric Analysis
pre-lab Questions
1. Write a balanced equation for the precipitation of calcium carbonate from potassium carbonate and calcium chloride.
2. Using this balanced equation, determine the limiting reactant if 15 grams of calcium chloride was reacted with 15 grams of potassium carbonate.
experiment 1: gravimetric analysis with calcium chloride and potassium carbonate
Data Sheet
Table 5: Data and Observations Table 6: Mass of CaCl2 after 24 Hours
Post-Lab Questions
1. Calculate the theoretical yield of the solid precipitate. Show your work.K2CO3 (aq) + CaCl2 (aq) → CaCO3(s) + 2KCl (aq)
2. Use Question 1 to calculate the percent yield of the solid precipitate. Show your work.
3. Based on your yield of calcium carbonate, calculate the mass of calcium present in the original solution.
4. Analyze the data and use your yield of calcium carbonate to determine the experimental concentration of calcium chloride in the solution that you made in steps 6 and 7. Show all calculations and report in % wt/v concentration.Calculating the grams of calcium chloride that reacted:
5. Calculate the theoretical concentration of calcium chloride in the solution that you made up in steps 6 and 7. Show all calculations and report in % wt/v concentration.
6. Using your answers from questions 4 and 5, create a bar graph comparing the theoretical to experimental percent concentrations of calcium chloride in the solution. Then, calculate percent error between the two concentrations.
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