Fall 07 HW4 solution - Homework Assignment#4 Name...

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Homework Assignment #4 Name____________________________ Laboratory Section (circle one) MW1.30 MW6.30 TTh7 1. Chapter 4, Problems 5, 11, 30, 32, 48, 50, 61, 63, 88 4.5 a) 2 — This is the only solution containing a divalent cation (Ca 2+ ). b) 3 — This is the only solution containing a divalent anion (SO 4 2– ). c) 1 — This is the only solution where both the cation (NH 4 + ) and the anion (Br ) are univalent. 4.11 a) Lithium nitrate, an ionic compound, would be expected to be soluble in water, and the solubility rules confirm this. b) Glycine (H 2 NCH 2 COOH) is a covalent compound, but it contains polar N-H and O-H bonds. This would make the molecule interact well with polar water molecules, and make it likely that it would be soluble. c) Pentane (C 5 H 12 ) has no bonds of significant polarity, so it would not be expected to be soluble in the polar solvent water. d) Ethylene glycol (HOCH 2 CH 2 OH) molecules contain polar O-H bonds, similar to water, so it would be expected to be soluble. 4.30 Check to see if any of the ion pairs are not soluble according to the solubility rules. a) Molecular: 3 CaCl 2 ( aq ) + 2 Cs 3 PO 4 ( aq ) Ca 3 (PO 4 ) 2 ( s ) + 6 CsCl( aq ) Total ionic: 3 Ca 2+ ( aq ) + 6 Cl ( aq ) + 6 Cs + ( aq ) + 2 PO 4 3– ( aq ) Ca 3 (PO 4 ) 2 ( s ) + 6 Cs + ( aq ) + 6 Cl ( aq ) Net ionic: 3Ca 2+ ( aq ) + 2PO 4 3– ( aq ) Ca 3 (PO 4 ) 2 ( s ) Spectator ions are Cs + and Cl .
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