Exam 2 Key - Chemistry 105 A Exam 2 Dr Jessica Parr First...

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1 Chemistry 105 A PLEASE PRINT YOUR NAME IN BLOCK LETTERS Exam 2 Name: __________________________________ 10/09/08 Last 4 Digits of USC ID:____ ____ ____ ____ Dr. Jessica Parr Lab TA’s Name: _________________________________ Lab: Tu 9 / Tu 1 / Tu 4 / W 1 / W 4 / F 1 Please circle lab section above . Question Points Score Grader 1 15 2 10 3 6 4 12 5 10 6 10 7 8 8 10 9 9 10 10 Total 100 Please Sign Below: I certify that I have observed all the rules of Academic Integrity while taking this examination. Signature: _______________________________________________________________ Instructions: 1. You must show work to receive credit. 2. If necessary, please continue your solutions on the back of the preceding page (facing you). 3. YOU MUST use black or blue ink. (No pencil, no whiteout, no erasable ink.) 4. There are 10 problems on 11 pages. Please count them before you begin. A periodic table and some useful equations can be found on the last page. 5. Good luck!! =) First Letter of last Name
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2 1. (15 pt) Determine the concentration of chloride ions in each of the following solutions. a. A solution prepared by dissolving 8.70 g of CaCl 2 in 342. mL of water. b. A solution prepared by diluting 55.0 mL of a 1.42 M NaCl solution to 400. mL. c. A solution prepared by mixing 259. mL of a 0.357 M solution of AlCl 3 with 241. mL of a 0.456 M solution of KCl.
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