Predict the direction in which the equilibrium will lie for the reaction H₂CO₃ + F^-
HCO₃^- + HF. K_a1(H₂CO₃) = 4.2 * 10^-7; K_a(HF) = 7.1 * 10^-4

Question

Predict the direction in which the equilibrium will lie for the reaction H₂CO₃ + F^- HCO₃^- + HF. K_a1(H₂CO₃)= 4.2 * 10^-7; K_a(HF)= 7.1 * 10^-4 A)to the right B)to the left C)in the middle

Quizplus · Accepted Answer

The reaction quotient Qc can be calculated as [HS1U1B12S1U1B0COS1U1B13S1U1B0][FS1U1P1-]/[S1S1P0] * [HS1U1B12S1U1B0COS1U1B13S1U1B0][S1U1P1-]/[HF] = (4.2*10^-10)/(7.1*10^-4) = 5.92*10^-7. The equilibrium constant Kc is 7.1*10^-4/4.2*10^-10 = 1.69*10^6. Since Qc < Kc, the reaction will proceed to the left to reach equilibrium, which means the equilibrium will lie to the left. Therefore, the best choice is B.

Predict the Direction in Which the Equilibrium Will Lie for the Reaction