1915-10 Name (on CAPS) Date Anwer all questions Each question caries S points Ma

Question

1915-10 Name (on CAPS) Date Anwer all questions Each question caries S points Mark you answer cleauly on papes in PMN and mark yout amower on Scanteon wih PENCIL . Must show the work with fonwla where cakculatioss are needed No credit for merely ciclng the 1. Which of the following is not a conjugate ackl- base pait A) HO and HO B) HPO and PO C HaPOe and HPO D) H PO, and HaPOe E) HPO.nd HPO 2 la the reaction HSOe(ong) OH-() SO(0)+HO, the conjogste acid-bave pairs are pair 2 pair 2 A HSO and SO H,O and OH- B Hsa_ and Hyo.. soa-and OH- C. HS04 and OH So-and H:O. D. HSO and HO; OH- and SO E. Hso,_ and OH"; SO2-and Hor 3. What is the pOtH of a 021 M solution of weak base Pyndine CJIN (k. 140)1250 A) 885 B) 1097 C) 409 D) 136 E) 4.77 Fr the reaction Brid + ado-± 2BrCl e, it is found that the coquilaberum concentrationsof Brs, Clh, and BrCl are 0.384 M, 0.446 M, and 227 x 10- M, respectively. What is the value of K? 4. D) 3.01 x 10- E) 3.32 x 10 A) 7.54 x 10 B) 1.33 x 104 C) 1.20 x 10

Explanation / Answer

1.

An acid - vase pair differ by only one proton is called conjugate acid - base pair.

(E) H3PO4 and HPO42-

2.

(A) HSO4- and SO42- ; H2O and OH-

3.

[OH-] = sqrt.(Kb*C) = sqrt.(1.4*10-9*0.21) = 0.0000171 M

pOH = - Log(0.0000171) = 4.76

(E)
4.

K = [BrCl]2 / [Br2][Cl2]

K = (2.27 * 10-3)2 / (0.384 * 0.446)

K = 3.01 * 10-5

(D)

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