50. If hydrogen iodide is placed into an otherwise empty, sealed container, what

Question

50. If hydrogen iodide is placed into an otherwise empty, sealed container, what would one expect to find after the system has attained equilibrium? 2Hi(g)= H2(g)+I2(g) Kp= 2.0 *10^-3 (A) only HI (B) equal amounts of H1,H2,I2 (C) mostly H1 with small amounts of H2 and I2 (D) mostly H2 and I2 with a small amount of H1 51. A solution is saturated with AgBr. The addition of HBr will AgBr(s) Ag(aq)+Br(aq) (A) increase the pH. (8) cause decrease in Ag^+ concentration. (C) cause an increase in Ag^+ concentration (d) not cause a change in Ag^+ concentration 52. What is the solubility product expression for Ag2PO4?

Explanation / Answer

50. Since the value of the equilibrium constant is very small, the equilibrium will be towards left. Thus, the equilibrium mixture will contain small amount of the products, hydrogen and iodine and the large amount of reactant HI.
Thus, option C is the correct answer.

51. When HBr is added, the common ion (bromide ion) is added which shifts the equilibrium of the dissociation of silver bromide towards left.
Thus more silver will react with more bromide ion to from silver bromide.
Hence, the concentration of silver ion will decrease.
Thus, the option B is the correct answer.

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