WA05_CHE-121-mar14 - Written Assignment 5 Chemical...

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Written Assignment 5: Chemical Reactions in Solution Answer all assigned questions and problems, and show all work. 1. Define electrolyte and nonelectrolyte and identify each of the following substances as a strong electrolyte, weak electrolyte, or nonelectrolyte: (5 points) An electrolyte is a substance that conducts electricity when dissolved in water while a nonelectrolyte is a substance that does not. a. H 2 O: Weak electrolyte. b. KCl: Strong Electrolyte. c. HNO 3: Strong Electrolyte. d. CH 3 COOH: Weak electrolyte. e. C 12 H 22 O 11: Nonelectrolyte. (Reference: Chang 4.9) 2. Write ionic and net ionic equations for the following reactions: (8 points) a. AgNO 3 + Na 2 SO 4 2Ag + (aq) + SO 4 - (aq) = Ag 2 SO 4 b. BaCl 2 + ZnSO 4 Ba + (aq) + SO 4 - (aq) = BaSO 4 c. (NH 4 ) 2 CO 3 + CaCl 2 Ca + (aq) + CO 3 - (aq) = CaCO 3 d. NaNO 3 + KCl → Doesn’t react. (Reference: Chang 4.21) 3. With reference to Table 4.2, suggest one method by which you might separate (a) K + from Ag + , (b) K + from Ag + , (c) NH 4 + from Ca 2+ , and (d) Ba 2+ from Cu 2+ . All cations are assumed to be in aqueous solution, and the common anion is the nitrate ion. (8 points) a. K + can be separated from Ag + by adding NaF. b. Same as a. c. NH 4 + can be separated from Ca 2+ by adding NaOH. d. Ba 2+ can be separated from Cu 2+ by adding NaF . (Reference: Chang 4.24) 4. Give the oxidation number of the underlined atoms in the following molecules and ions: (7 points) a. Cl F = 1+ b. I F 7 = 7+ c. C H 4 = 4- 1 Copyright © 2014 by Thomas Edison State College. All rights reserved.
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d. C 2 H 2 = 1- e. C 2 H 4 = 2- f. K 2 Cr O 4 = 6+ g. K 2 Cr 2 O 7 = 6+ h. KMn O 4
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  • Spring '15
  • Khurana
  • Chemistry, Reaction, Sodium, Chemical reaction, Sodium chloride, Sodium hydroxide

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