University:
Kentucky State University
Course:
CHE 101 | General Chemistry I
Academic year:

2019
Views:

320

Pages:

3
Author:

gaarmaakbn9h

Chemistry (ch17) 1. The Ksp of Bi2S3 is 1.6 x 10-72. What is the molar solubility of this compound in aqueous solution? a) 1.6 x 10-72 M b) 4.4 x 10-15 M c) 1.7 x 10-15 M d) 1.2 x 10-24 M Answer: c 2. Which is an INCORRECT match? a) BaSO4 = x-ray imaging b) CaCO3 = limestone c) Ca3(PO4) = bones and teeth d) all are correct matches Answer: d 3. The mineral fluorite is composed of CaF2. The molar solubility of calcium fluoride in water is 2.1 x 10-4 moles/L. What is the Ksp of CaF2? a) 3.7 x 10-11 b) 2.14 x 10-4 c) 4.6 x 10-8 d) 9.8 x 10-12 Answer :a 4. Gold chloride, AuCl, has a Ksp of 2.0 x 10-13. How many grams of gold are found in 500 mL of a saturated aqueous solution of AuCl? a) 1.0 x 10-13 g b) 4.5 x 10-7 g c) 2.2 x 10-7 g d) 4.4 x 10-5 g Answer: d 5. A 1.000 L solution is prepared in which Au+, Ag+, and Cu+ ions are present in solution as nitrates, all at a concentration of 0.0010 M. A solution of sodium chloride is slowly added. Which compound will begin to precipitate first? The Ksp of AuCl = 2.0 x 10-13; AgCl = 1.8 x 10-10; CuCl = 1.9 x 10-7. a) CuCl b) AgCl c) AuCl d) NaNO3 e) NaCl Answer: c 6. In Problem #5, at what concentration [Cl-] will precipitation of the first salt begin? a) 2.0 x 10-13 M b) 2.0 x 10-10 M c) 4.5 x 10-7 M d) 1.9 x 10-4 M Answer: b 7. The Ksp of bismuth iodide, BiI3, is 8.1 x 10-19. How many grams of this compound can dissolve in a Liter of aqueous solution? BiI3(s) <---> Bi3+ + 3 Ia) 4.8 x 10-16 g b) 8.1 x 10-19 g c) 1.3 x 10-5 g d) 3.0 x 10-20 g e) 7.8 x 10-3 g Answer: e 8. The mineral sphalerite found in zinc mines near Lebanon, Tennessee is composed of ZnS. The molar solubility of ZnS in water is 3.3 x 10-11 moles/L. What is the Ksp of ZnS? a) 2.14 x 10-4 b) 1.1 x 10-21 c) 5.7 x 10-6 d) 3.3 x 10-11 Answer: b 9. Nickel carbonate, NiCO3, has a Ksp of 6.6 x 10-9. What is the molar solubility of nickel carbonate? a) 3.9 x 10-3 mol/L b)4.35 x 10-17 mol/L c) 6.6 x 10-9 mol/L d) 8.1 x 10-5 mol/L Answer: d 10. A 1.000 L solution is prepared in which Ni2+, Ag+, and Mn2+ ions are present in solution, all at a concentration of 0.0010 M. A solution of sodium sulfide Na2S is slowly added. Which compound will begin to precipitate FIRST? The Ksp of NiS = 3.0 x 10-21; Ag2S = 1.0 x 10-49; MnS = 5.1 x 10-15. a) Ag2S b) NiS c) MnS d) Na2S Answer: a 11. In Problem #10, at what concentration [S2-] will precipitation of the first salt begin? a) 0.001 M b) 3.0 x 10-18 M c) 5.1 x 10-12 M d) 1.0 x 10-43 M Answer: d