University:
Eastern Kentucky University
Course:
CHE 111 | General Chemistry
Academic year:

2021
Views:

53

Pages:

3
Author:

Ean Mason

Stoichiometry of a Precipitation Reaction Final Student Report Name Student ID Lesson Stoichiometry of a Precipitation Reaction Institution Session Fall 2021 Course Instructor Exercise 1 1. Given that a theoretical yield for isolating Calcium Carbonate in this experiment would be 100%. From that information and based on the results you obtained in this experiment, describe your success in the recovery of calcium carbonate and suggest two possible sources of error that would have caused you to not obtain 100% yield. B I U 59 Word(s) The two possible sources of error are liquid measurement, meaning the amount of extra two ml’s to rinse the remaining sodium carbonate could have been miscalculated. Also, placement and airﬂow within my home could have played a factor, where as in a lab, those factors are more secure. Excess moisture within the ﬁlter paper could also be a factor. 2. What impact would adding twice as much Na CO quantities have on the quantity of product produced? B I than required 2 for 3 stoichiometric U You would then need twice as much calcium carbonate dehydrate to keep the reaction within stoichiometric limits. 17 Word(s) 3. Determine the quantity (g) of pure CaCl in 7.5 g of CaCl2 •9H O. Show your work. 2 B I 2 U 3g7.5g/273g per mol= 0.027mols CaCl 2 x 9H O is 1/1 reaction of CaCl . 2 CaCl 2 =0.027mol x 111g/mol= 3g 18 Word(s) 2 4. Determine the quantity (g) of pure MgSO in 2.4 g of MgSO 4 •7H O. Show your work. 4 B I 2 U 21 Word(s) 1.2gMgSO 4x7H 2O = 246.47g per mol MgSO 4 =120.37 MgSO 4 x 7H O 2 = 120.37 / 246.47 = 0.488 x 100 = 48.8 2.4 x 0.49 = 1.17 = 1.2g 5. Conservation of mass was discussed in the background. Describe how conservation of mass (actual, not theoretical) could be checked in the experiment performed. B I U You can check the mass of all the materials used and calculate the actual mass of the by products after the experiments. This would check to insure that the correct quantities were used and that the mass of each item is exact. Data Table 1: Stoichiometry Values 42 Word(s) Initial: CaCl •2H O2 (g) 2 1.5 Initial: CaCl •2H O2 (mol) 2 147.02 Initial: CaCl (mol) 2 0.0102 Initial: Na CO 2 3(mol) 106 Initial: Na CO 2 3(g) 1 Theoretical: CaCO (g)3 1.02 Mass of Filter paper (g) 0.92 Mass of Filter Paper + CaCO (g) 3 2.00 Actual: CaCO (g) 3 1.08 % Yield: 100