ws5302key - CH302 Worksheet 5 Answer Key A charming...

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CH302 Worksheet 5 Answer Key: A charming calculator-free worksheet concerning K sp , K w , K a b and strong acids and bases. 1. Define K sp for the dissolution of the following salts in water. If necessary, write a balanced chemical equation for the dissolution first. a. RbI, RbI(s) Rb + (aq) + I - (aq), K sp = [Rb + ] [I - ] b. Ca(NO 3 ) 2 , K sp = [Ca 2+ ] [NO 3 - ] 2 c. K 3 PO 4 , K sp = [K + ] 3 [PO 4 3- ] d. SrS, K sp = [Sr 2+ ] [S 2- ] e. Fe 2 (SO 4 ) 3 , K sp = [Fe 3+ ] 2 [SO 4 2- ] 3 f. K 3 Fe(C 2 O 4 ) 3 , K sp = [K + ] 3 [Fe 3+ ] [C 2 O 4 2- ] 3 2. Consider each of the salts below. Express each salt's molar solubility (we'll call it x) in terms of K sp . It might be useful to first write a balanced equation for each salt's dissolution and complete a RICE diagram. a. Cu 3 (PO 4 ) 2 , molar solubility = x = (K sp /108) 1/5 R Cu 3 (PO 4 ) 2 (s) 3 Cu 2+ (aq) + 2 PO 4 3- (aq) I ~ 0 0 C ~ + 3x +2x E ~ 3x 2x K sp = [Cu 2+ ] 3 [PO 4 3- ] 2 = (3x) 3 (2x) 2 = 108x 5 K sp = 108x 5 x = (K sp /108) 1/5 b. MgSe, x = (K sp ) 1/2 c. Li 3 PO 4 , x = (K sp /27) 1/4 d. K 3 Fe(C 2 O 4 ) 3 , x = (K sp /729) 1/7 3. Estimate the actual molar solubilities of the following salts in water based on their K sp values. a. Barium Sulfate, BaSO 4 , K sp = 1.08 x10 -10 , molar solubility = x 10 -5 M b. Cadmium Phosphate, Cd 3 (PO 4 ) 2 , K sp = 2.53 x10 -33 , x 10 -6 M c. Lithium Carbonate, Li
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This note was uploaded on 10/07/2011 for the course CHEMISTRY 51635 taught by Professor Laude during the Spring '10 term at University of Texas.

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ws5302key - CH302 Worksheet 5 Answer Key A charming...

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