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A set of key concepts from chapter 4 of ziegler's chemistry textbook (10th edition) for the fall 2005 semester. It includes terms to be defined, problems to be solved, and answers to selected problems. Topics covered include solutions, solvents, solutes, dissolving, aqueous solutions, strong and weak electrolytes, precipitation reactions, acid-base reactions, oxidation numbers, redox reactions, and molarity.
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CH 221 – Ziegler KEY CONCEPTS Chapter 4 Fall 05 10 th^ ed.
Class period 1 – Read pp. 120-125.
Class period 2 Read pp 126-
Class period 3 – Read pp. 131-137b.
Class period 4 – Read pp. 137b-141, 142m-144m, 144-150.
Class period 5 – Read pp. 151-
For the Monday Thursday section: Class Period 1: KC 1, 2 Class Period 2: KC 3, 4, 5, 6 Class Period 3: KC 7, 8, 9 Class Period 4 KC 9.
CH 221 – Ziegler KEY CONCEPTS Chapter 4 Fall 05 10 th^ ed.
Answers to Assigned problems
4.24 a) 2Cr+3(aq) + 3CO 3 -2^ (aq) Æ Cr 2 (CO 3 ) 3 (s) Spectators: NH 4 +, and SO 4 -
b) Ba+2(aq) + SO 4 -2^ (aq) Æ BaSO 4 (s) Spectators: NO 3 -^ and K+ c) Fe+2^ (aq) + 2 OH-^ (aq) Æ Fe(OH) 2 (s) Spectators: K+^ and NO 3 -
4.40 a) overall equation: HC 2 H 3 O 2 (aq) + KOH (aq) Æ H 2 O(l) + KC 2 H 3 O 2 (aq)
Net Ionic equation: HC 2 H 3 O 2 (aq) + OH-^ (aq) Æ H 2 O(l) (acetic acid is a weak acid) b) overall equation: Cr(OH) 3 (s) + 3HNO 3 (aq) Æ Cr(NO 3 ) 3 (aq) +3H 2 O (l) net Ionic equation: Cr(OH) 3 (s) + 3H+(aq) Æ Cr+3^ (aq) + 3H 2 O (l) (the solid dissolves) c) overall Equation; 2HClO (aq) + Ca(OH) 2 (aq) Æ Ca(ClO) 2 (aq) + 3H 2 O(l) net Ionic Equation: HClO (aq) + OH-^ Æ H 2 O (l) + ClO-^ (aq)
4.50 a) Ti =+4, b) Sn = +4 c) C = +3 d) N = -2 e) N= +3 f) Cr = +
4.62 a) 0.193 M Na 2 SO 4
b) 0.0106 moles KMnO 4 c) 22.0 mL of the concentrated solution.
4.80 a) 84.2 mL of a 0.120 M HCl solution
b) 20.0 mL H 2 SO 4 c) 0.0949 M BaCl 2 d) 0.329 grams of Ca(OH) 2
4.82 80.4 grams HC 2 H 3 O 2 in one quart of this vinegar.