CHEM 141 (Watts). Fall 2008. Homework Assignment 7.
Due date and time: in my office before 3 p.m. on Monday, December 8, 2008.
Name: ________________________________
If you need additional sheets of paper, please write your name on each sheet. Please write
clearly and neatly, showing appropriate work. Credit will not be given for illegible or
ambiguous work. Answers without appropriate working shown will not receive any
credit, even if they are correct. Please staple your work together before turning it in. And,
no, I do not have a stapler in the classroom.
1. Calculate the mass of CuSO4 (s) to make the following aqueous solutions: (a)
250.0 mL of 1.200 M CuSO4 (aq); (b) 650.0 mL of 0.300 M CuSO4 (aq).
2. Suppose 250.0 mL of 0.200 M AgNO3 (aq) is reacted with an excess of NaCl
(aq). What is the mass of the AgCl (s) precipitate formed?
3. What volume of 0.250 M NaOH (aq) should be used to neutralize 650.0 mL of
0.400 M HNO3 (aq)?
4. If 100.0 mL of water is added to 250.0 mL of 0.450 M Na2CO3 (aq), what are the
concentrations of Na+ and CO32- ions in the new solution?
5. Calculate the number of Na+ ions per mL in 1 M Na2CO3 (aq).