Exam 18: Solubility and Complex-Ion Equilibria

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What molar concentration of silver ion could exist in a solution in which the concentration of CrO42- is 1.0 × 10-4 M? (Ksp of Ag2CrO4 = 1.1 × 10-12)

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A small amount of solid calcium hydroxide is shaken vigorously in a test tube almost full of water until no further change occurs and most of the solid settles out. The resulting solution is:

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Write the solubility product constant expression for the following salt: CoS.

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A saturated solution of silver iodide has a concentration of 9.1 × 10-9 M. What is the Ksp of this compound?

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Which of the following reduces the solubility of calcium fluoride?

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What is the minimum pH at which cobalt(II) hydroxide [Ksp = 2.0 × 10-16] will precipitate from a solution 0.020 M in CO32+?

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The Ksp of AgCl is 1.7 × 10-10. How many moles of MnCl2 can be dissolved in one liter of a solution in which [AgNO3] = 3.4 × 10-4 M before a precipitate appears?

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The molar solubility of calcium phosphate in a saturated aqueous solution of the salt is given by ________.

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Which of the following is most soluble?

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What is the molar solubility of barium carbonate in pure water? (Ksp = 5.1 × 10-9)

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What is the minimum concentration of CN- that will prevent the precipitation of AgX(s) from a solution that is 0.149 M in X-(aq) and 0.0184 M in Ag+(aq)? (Ksp for AgX(s) = 5.2 × 10-17; Kf for Ag(CN)2- = 5.6 × 1018)

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The diverse ion effect is also called the salt effect.

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A solution contains [Ba2+] = 5.0 × 10-5 M, [Ag+] = 3.0 × 10-5 M, and [Zn2+] = 2.0 × 10-7 M. Sodium oxalate is slowly added so that [C2O42-] increases. A solution contains [Ba<sup>2+</sup>] = 5.0 × 10<sup>-5</sup> M, [Ag<sup>+</sup>] = 3.0 × 10<sup>-5</sup> M, and [Zn<sup>2+</sup>] = 2.0 × 10<sup>-7</sup> M. Sodium oxalate is slowly added so that [C<sub>2</sub>O<sub>4</sub><sup>2-</sup>] increases.   What is the concentration of the first cation to precipitate when the second cation just begins to precipitate? What is the concentration of the first cation to precipitate when the second cation just begins to precipitate?

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Fractional precipitation is a method to precipitate only part of the concentration of an ion.

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Ion pairs as a limitation to Ksp are more likely to be a problem with NaCl than with MgSO4.

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The solubility of CaF2 is 0.00021 mole per liter. What is the solubility product constant for CaF2?

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What is the molar solubility of PbI2 (Ksp = 7.1 × 10-9) in 0.10 M Pb(NO3)2?

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Consider an aqueous solution which is 0.020 M in Pb2+ and 0.20 M in Ag+. If concentrated potassium iodide solution (so that volume changes may be neglected) is added gradually with good stirring to this solution, which precipitate will form first? Ksp for PbI2 = 7.1 × 10-9; for AgI = 8.31 × 10-17

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Predict the molar solubility of the following salt in a solution that contains the given concentration of one of its ions: AgI; [I-] = 7.2 × 10-6 M; Ksp = 8.5 × 10-17

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In a qualitative cation analysis, the unknown ion is not precipitated by HCl or H2S, but is precipitated by CO32-. The unknown ion is ________.

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