Question

2. (9 pts) The three reactions below are all at equilibrium simultaneously in solution. Ca²+ (aq)+C,0% (aq) +CaC,0,(s) H,C,D,(aq)+H'(aq) + HC,D,(aq) HC,07(aq) + H+ (aq)+C,0; (aq) a. If HNO3 is added to this solution, would you expect to see more or less of the precipitate (CaC204) formed in the solution? Explain your reasoning by showing the effect of the addition of HNO3 on the equilibrium for the reaction. b. If Ba(OH)2 is added to this solution, would you expect to see more or less of the precipitate (CaC2O4) formed in the solution? Explain your reasoning by showing the effect of the addition of barium hydroxide on the equilibrium for the reaction. c. If a weak acid, such as nitrous acid (HNO2) is added to the above solution, would you expect to see more or less precipitate (CaC,0.) formed than when hydrochloric acid is added to the solution? Explain your reasoning by showing the effect of the addition of acetic acid on the equilibrium for the reaction and how this differs from the effect of hydrochloric acid on the equilibrium.

Answer 1

B) on adding BaCOH)2 a on o rum H₂C2O4 - H+ + 4cgoy Hoy - 1+ + C₂0 yt- ca²t & 4042 - caCo4 ( 4 On Addition of HNO3(a strong acid), the come of " at equilibrium increases. Acc to Lethhateliers sal, the eam wire thus be shifted in the backward direction .. ng Ba(OH)2, on it from it reails with from eam and thus the conch at equilibr of fit increases. Due to this, the forward is faroused . Thus eam shifts to right. The major difference between He and HNO is the fact that He is a strong and and it gives is completely ionised and HNO2 being weak acid doesnot conise completely in solution. So, on adding HNoge the eam will shift to left and the amount of precipitate decreases. The only diff. will be in the extent of Ht increase with Hll of those