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problem_set_chapter_16-key

# problem_set_chapter_16-key - problem set chapter 16 Key 1...

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problem set chapter 16 Key 1. For any conjugate acid-base pair, it is true that K b = K a K w . FALSE 2. NaCl is added slowly to a solution that is 0.010 M each in Cu + , Ag + , and Au + . The K sp 's for CuCl, AgCl, and AuCl are 1.9 × 10 -7 , 1.8 × 10 -10 , and 2.0 × 10 -13 , respectively. Which compound will precipitate first? AuCl 3. Calculate the equilibrium constant K c for the net reaction shown below. (For AgI, K sp = 8.3 × 10 -17 ; for Ag(NH 3 ) 2 + , K f = 1.5 × 10 7 .) AgI(s) + 2NH 3 (aq) Ag(NH 3 ) 2 + (aq) + I - (aq) 1.2 × 10 -9 4. For PbCl 2 (K sp = 2.4 × 10 -4 ), will a precipitate of PbCl 2 form when 0.10 L of 3.0 × 10 -2 M Pb(NO 3 ) 2 is added to 400 mL of 9.0 × 10 -2 M NaCl? a. Yes, because Q > K sp. B. No, because Q < K sp. c. No, because Q = K sp. d. Yes, because Q < K sp. 5. You have 500.0 mL of a buffer solution containing 0.30 M acetic acid (CH 3 COOH) and 0.20 M sodium acetate (CH 3 COONa). What will the pH of this solution be after the addition of 20.0 mL of 1.00 M NaOH solution? [K a = 1.8 × 10 -5 ] 4.71 6. What is the optimum pH of a sodium formate/formic acid buffer? (For formic acid, K a = 1.7 × 10 -4 ) 3.77 7. To 1.00 L of a 0.100 M aqueous solution of benzoic acid (C 6 H 5 COOH) is added 1.00 mL of 12.0 M HCl. What is the percentage ionization of the benzoic acid in the resulting solution? [Given: K

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problem_set_chapter_16-key - problem set chapter 16 Key 1...

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