# Mns s 2h mn 2 h 2 s g at 25 o c the solubility

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6. MnS (s) + 2H + Mn 2+ + H 2 S (g) At 25 o C the solubility product constant, K sp , for MnS is 5x10 -15 and the acid dissociation constants K 1 and K 2 for H 2 S are 1x10 -7 and 1x10 -13 , respectively. What is the equilibrium constant for the reaction represented by the equation above at 25 o C? (A) 1x10 -13 / 5x10 -15 (B) 5x10 -15 / 1x10 -7 (C) 1x10 -7 / 5x10 -15 (D) 5x10 -15 / 1x10 -20 (E) 1x10 -20 / 5x10 -15 Answer: D 7. HSO 4 - + H 2 O H 3 O + + SO 4 2- In the equilibrium represented above, the species that act as bases include which of the following? I. HSO 4 - II. H 2 O III. SO 4 2- 8. H 2 C 2 O 4 + 2H 2 O 2H 3 O + + C 2 O 4 2- Oxalic acid is a diprotic acid with K 1 = 5.36x10 -2 and K 2 = 5.3x10 -5 . For the reaction above, what is the equilibrium constant?

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9. PCl 3(g) + Cl 2(g) PCl 5(g) + energy Some PCl 3 and Cl 2 are mixed in a container at 200 o C and the system reaches equilibrium according to the reaction above. Which of the following causes an increase in the number of moles of PCl 5 present at equilibrium? I. Decreasing the volume of the container II. Raising the temperature III. Adding a mole of He gas at constant volume 10. 4HCl (g) + O 2(g) 2Cl 2(g) + 2H 2 O (g) Equal numbers of moles of HCl and O 2 in a closed system are allowed to reach equilibrium as represented by the equation above. Which of the following must be true at equilibrium? I. [HCl] must be less that [Cl 2 ] II. [O 2 ] must be greater than [HCl] III. [Cl 2 ] must equal [H 2 O] (A) I only (B) II only (C) I and III (D) II and III (E) I, II, and III Answer: D
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