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CL Chem Chapter 17 continuation: Ksp Past AP Problems 2011 form B, question #1 Answer the following questions about the solubility and reactions of the ionic compounds M(OH)2 and MCO3, where M represents an unidentified metal. (a) Identify the charge of the M ion in the ionic compounds above. (b) At 25°C, a saturated solution of M(OH)2 has a pH of 9.15. (i) Calculate the molar concentration of OH (aq) in the saturated solution. (ii) Write the solubility-product constant expression for M(OH)2. (iii) Calculate the value of the solubility-product constant, K., for M(OH)2 at 25°C. sp (c) For the metal carbonate, MCO3, the value of the solubility-product constant, Kp is 7.4×10-14 at 25°C. On the basis of this information and your results in part (b), which compound, M(OH)2 or MCO, has the greater molar solubility in water at 25°C? Justify your answer with a calculation. (d) MCO, decomposes at high temperatures, as shown by the reaction represented below. MCO3(s) → MO(s) + CO₂(g) A sample of MCO3 is placed in a previously evacuated container, heated to 423 K, and allowed to come to equilibrium. Some solid MCO3 remains in the container. The value of K, for the reaction at 423K is 0.0012. (i) Write the equilibrium-constant expression for K, of the reaction. (ii) Determine the pressure, in atm, of CO2(g) in the container at equilibrium at 423 K. (iii) Indicate whether the value of AG° for the reaction at 423 K is positive, negative, or zero. Justify your answer. (SKIP this question for now! It's covered in chap 19)

CL Chem Chapter 17 continuation: Ksp Past AP Problems 2011 form B, question #1 Answer the following questions about the solubility and reactions of the ionic compounds M(OH)2 and MCO3, where M represents an unidentified metal. (a) Identify the charge of the M ion in the ionic compounds above. (b) At 25°C, a saturated solution of M(OH)2 has a pH of 9.15. (i) Calculate the molar concentration of OH (aq) in the saturated solution. (ii) Write the solubility-product constant expression for M(OH)2. (iii) Calculate the value of the solubility-product constant, K., for M(OH)2 at 25°C. sp (c) For the metal carbonate, MCO3, the value of the solubility-product constant, Kp is 7.4×10-14 at 25°C. On the basis of this information and your results in part (b), which compound, M(OH)2 or MCO, has the greater molar solubility in water at 25°C? Justify your answer with a calculation. (d) MCO, decomposes at high temperatures, as shown by the reaction represented below. MCO3(s) → MO(s) + CO₂(g) A sample of MCO3 is placed in a previously evacuated container, heated to 423 K, and allowed to come to equilibrium. Some solid MCO3 remains in the container. The value of K, for the reaction at 423K is 0.0012. (i) Write the equilibrium-constant expression for K, of the reaction. (ii) Determine the pressure, in atm, of CO2(g) in the container at equilibrium at 423 K. (iii) Indicate whether the value of AG° for the reaction at 423 K is positive, negative, or zero. Justify your answer. (SKIP this question for now! It's covered in chap 19)

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Chapter15: Acid-base Equilibria
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CL Chem Chapter 17 continuation: Ksp Past AP Problems 2011 form B, question #1 Answer the following questions about the solubility and reactions of the ionic compounds M(OH)2 and MCO3, where M represents an unidentified metal. (a) Identify the charge of the M ion in the ionic compounds above. (b) At 25°C, a saturated solution of M(OH)2 has a pH of 9.15. (i) Calculate the molar concentration of OH (aq) in the saturated solution. (ii) Write the solubility-product constant expression for M(OH)2. (iii) Calculate the value of the solubility-product constant, K., for M(OH)2 at 25°C. sp (c) For the metal carbonate, MCO3, the value of the solubility-product constant, Kp is 7.4×10-14 at 25°C. On the basis of this information and your results in part (b), which compound, M(OH)2 or MCO, has the greater molar solubility in water at 25°C? Justify your answer with a calculation. (d) MCO, decomposes at high temperatures, as shown by the reaction represented below. MCO3(s) → MO(s) + CO₂(g) A sample of MCO3 is placed in a previously evacuated container, heated to 423 K, and allowed to come to equilibrium. Some solid MCO3 remains in the container. The value of K, for the reaction at 423K is 0.0012. (i) Write the equilibrium-constant expression for K, of the reaction. (ii) Determine the pressure, in atm, of CO2(g) in the container at equilibrium at 423 K. (iii) Indicate whether the value of AG° for the reaction at 423 K is positive, negative, or zero. Justify your answer. (SKIP this question for now! It's covered in chap 19)
Transcribed Image Text:CL Chem Chapter 17 continuation: Ksp Past AP Problems 2011 form B, question #1 Answer the following questions about the solubility and reactions of the ionic compounds M(OH)2 and MCO3, where M represents an unidentified metal. (a) Identify the charge of the M ion in the ionic compounds above. (b) At 25°C, a saturated solution of M(OH)2 has a pH of 9.15. (i) Calculate the molar concentration of OH (aq) in the saturated solution. (ii) Write the solubility-product constant expression for M(OH)2. (iii) Calculate the value of the solubility-product constant, K., for M(OH)2 at 25°C. sp (c) For the metal carbonate, MCO3, the value of the solubility-product constant, Kp is 7.4×10-14 at 25°C. On the basis of this information and your results in part (b), which compound, M(OH)2 or MCO, has the greater molar solubility in water at 25°C? Justify your answer with a calculation. (d) MCO, decomposes at high temperatures, as shown by the reaction represented below. MCO3(s) → MO(s) + CO₂(g) A sample of MCO3 is placed in a previously evacuated container, heated to 423 K, and allowed to come to equilibrium. Some solid MCO3 remains in the container. The value of K, for the reaction at 423K is 0.0012. (i) Write the equilibrium-constant expression for K, of the reaction. (ii) Determine the pressure, in atm, of CO2(g) in the container at equilibrium at 423 K. (iii) Indicate whether the value of AG° for the reaction at 423 K is positive, negative, or zero. Justify your answer. (SKIP this question for now! It's covered in chap 19)
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