First Order Second Order IAl, IAl, IAJ 693 kIA] Note: Use Table 5, p.18, in the
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First Order Second Order IAl, IAl, IAJ 693 kIA] Note: Use Table 5, p.18, in the CHM 132 Tables booklet to do any problems about metal ion complexes Directions: Choose the ONE BEST answer for each question. 1. A solution contains 0.123 M SO,2 (aq) and 0.478 M CO, (aq). If Ag (aq) ions are slowly added which compound (Ag,SO, or Ag CO) will ppt first and at what [Ag']? (In other words. which of the following is entirely correct?) (Suggestion: Write the dissolving equations and K, expressions for Ag SO, and Ag CO, before starting this problem.) a. Ag,so, precipitates first at [Ag+] = 1.1 x 102 M b. Ag SO, precipitates first at [Ag'1- 1.3 x 104 M c. Ag-Co, precipitates first at [Ag+] = 1.7 x 1011 M d. Ag CO, precipitates first at [Ag'1-4.1 x 10 M e. Ag CO, precipitates first at [Ag'1-1.3 x 10 s M 2. Which of the following sparingly soluble salts would be expected to be more soluble in an acid, that is, in a solution of H (aq), than in pure water? 1, 2, and 3 only c. 2 and 3 only d. 1, 4, and 5 only 1 and 3 only a. 4 and 5 only b. e. 3. Determine the coordination number of Fe in the complex [Fe(en) CI,]'. and then answer the following question. What is the most likely molecular geometry of [Fe(en),C1,1'? a. linear b. octahedral c. trigonal planar d. trigonal bipyramidal e. tetrahedral or square planarExplanation / Answer
Q1
Ksp Ag2CO3 = [Ag+]^2[CO3-2]
8.46 x 10-12 = (Ag+)^2 ( 0.123)
[Ag+] = sqrt((8.46*10^-12)/(0.123)) = 0.0000082934 M = 8.3*10^-6 M
Ksp Ag2SO3 = [Ag+]^2[SO4-2]
Ksp = 1.20 x 10-5
[Ag+] = sqrt((1.2*10^-5)/(0.478)) = 0.005010M = 5*10^-3
clearly, Ag2CO3 precipitates first, since it has lowest Ksp value
order is about 10^-6 so choose D (the value depends on your KSP values)
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