CH 102 Mock EXAM 3 Spring 2006

CH 102 Mock EXAM 3 Spring 2006 - CH 102 Mock EXAM 3 Spring...

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Saturated Solution Solution I Solution II Solution III CH 102 Mock EXAM 3 Spring 2006 1. In the reaction: CaO(s) + CO 2 (g) → CaCO 3 (s) A. Ca 2+ acts as a Lewis acid and CO 3 2- acts as a Lewis base. B. O 2- acts as a Lewis base and CO 2 acts as a Lewis acid. C. O 2- acts as a Lewis base and Ca 2+ acts as a Lewis acid. D. CaO is the Lewis acid and CaCO 3 is its conjugate base. E. CO 2 is the Lewis acid and CaCO 3 is its conjugate base. 2. Aqueous solutions of which of the following salts will give the most basic solution? A. NaOCl C. NaClO 2 B. NaCl D. NaClO 3 3. Which of the following salt solutions is basic? 4. Lewis acids 5. What is the pH of a solution which is 0.0100 M in HA (a weak acid) and also 0.0020 M in NaA (K a = 9.0 x 10 -6 )? 6. Which of the following is the most effective buffer for a pH value of 7.45? A. H 2 CO 3 and HCO 3 - , K a = 4.4 x 10 -7 B. HCO 3 - and CO 3 2- , K a = 4.7 x 10 -11 C. H 2 S and HS - , K a = 1.0 x 10 -7 D. H 2 PO 4 - and HPO 4 2- , K a = 6.3 x 10 -8 7. A 0.1 M solution of HCl is used to titrate a 25-mL sample of a 0.1 M solution of ammonia, K b = 1.8 x 10 -5 . At the equivalence point, the pH is approximately 8 ForAg 2 CO 3 , K sp = 8 x 10 -12 . What is Ag + concentration in a Ag 2 CO 3 solution that is 0.010 M in CO 3 2- ? A. 2 x 10 -9 M C. 6 x 10 -5 M B. 3 x 10 -5 M D. 8 x 10 -4 M
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