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# 2 k sp na h co 2 3 2 3 k sp na h co 2 3 correct 4 k

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2. K sp = [Na + ] [H + ] [CO - 2 3 ] 2 . 3. K sp = [Na + ] [H + ] [CO 2 - 3 ] . correct 4. K sp = [Na + ] [H + ] [C 4+ ] [O 2 - ] 3 . Explanation: 007 4.0points Pure water is saturated with PbCl 2 . In this saturated solution 1. [Pb 2+ ] [Cl - ] = K sp . 2. [Pb 2+ ] = [Cl - ] . 3. 2 [Cl - ] = [Pb 2+ ] . 4. K sp = [Pb 2+ ] . 5. [Pb 2+ ] = 0 . 5 [Cl - ] . correct Explanation: 008 4.0points Assume the molar solubility of silver chromate (Ag 2 CrO 4 ) is represented as x . Which of the following expressions correctly expresses the relationship between the molar solubility of silver chromate and the solubility product constant ( K sp ) for this compound? 1. K sp = 4 x 2 2. K sp = 4 x 3 correct 3. K sp = 2 x 3 4. K sp = x 2 5. K sp = 2 x 2 Explanation: The equation for the dissociation of Ag 2 CrO 4 is written as Ag 2 CrO 4 2 Ag + + CrO - 4 . The expression for K sp = bracketleftbig Ag + bracketrightbig 2 bracketleftbig CrO - 4 bracketrightbig . Since the molar solubility is x , K sp can be rewritten (in terms of x ) as K sp = [2 x ] 2 [ x ] = 4 x 3 . bracketleftbig Ag + bracketrightbig = 2 x because for every salt molecule that dissociates, 2 Ag + ions are produced.

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casey (rmc2555) – Homework 10 – holcombe – (51395) 3 009 4.0points Which of the following salts would have ap- proximately the same molar solubility as AlPO 4 , K sp = 10 - 20 ? 1. HgI 2 , K sp = 10 - 30 correct 2. Co(OH) 2 , K sp = 10 - 15 3. BaSO 4 , K sp = 10 - 10 4. Cd 3 (PO 4 ) 2 , K sp = 10 - 33 Explanation: Both AlPO 4 and HgI 2 will approximate mo- lar solubilities of 10 - 10 . 010 4.0points Determine the molar solubility of aluminum oxide (Al 2 O 3 ) if K sp = 1 . 08 × 10 - 15 . 1. 1 × 10 - 1 M 2. 3 × 10 - 8 M 3. 10 M 4. 4 × 10 - 4 M correct 5. 2 M Explanation: The equation for K sp = (2 x ) 2 (3 x ) 3 = 108 x 5 x = parenleftbigg 1 . 08 × 10 - 15 108 parenrightbigg 1 / 5 = 4 × 10 - 4 M. 011 4.0points What is the molar solubility of PbCl 2 in an aqueous solution of 0.5 M NaCl? The K sp of PbCl 2 is 1 . 14 × 10 - 5 . 1. 4 . 56 × 10 - 4 2. 4 . 56 × 10 - 5 correct 3. 2 . 28 × 10 - 4 4. 1 . 14 × 10 - 5 5. 2 . 28 × 10 - 5 Explanation: 012 4.0points For Ag 2 SO 4 , K sp = 1 . 7 × 10 - 5 , and the equi- librium is Ag 2 SO 4 2 Ag + + SO 2 - 4 . What is the concentration of Ag + in a sat- urated solution of Ag 2 SO 4 in which [SO 2 - 4 ] is made equal to 0.040 M by the addition of Na 2 SO 4 ? 1. 1 . 0 × 10 - 2 M 2. 2 . 1 × 10 - 4 M 3. 4 . 2 × 10 - 4 M 4. 1 . 8 × 10 - 2 M 5. 2 . 1 × 10 - 2 M correct Explanation: 013 4.0points The solubility product constant of BaF 2 is 1 . 7 × 10 - 6 and that of CaF 2 is 3 . 9 × 10 - 11 . What would happen if a saturated solution of BaF 2 in equilibrium with excess undissolved BaF 2 was made 1 . 00 M in CaCl 2 (which is very soluble)?
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