2015-100 EXAM-43 2018SPRING CHEMI Wellt First-BRANDON Amwer ?? queition Each que

Question

2015-100 EXAM-43 2018SPRING CHEMI Wellt First-BRANDON Amwer ?? queition Each question cames 5 points Name (in CAPS): n0MA? Date: Last: * Mank your anewer clesdly on paper in PEN and mack youar anewer on Must show the wock with formula where calculations are needed No credit for merely circling the 1. Which of the following is not a conjugsne acid-base D) H.PO, and H:POr In the reaction Hsonaq) + Oll1aq) ? SO-feq) + H om de on agate acoHase pairs are pair 1 pair 2 A HSO and SO H:0 and OH B. HSO4 and HyO So?- and OH C. HSO and Of SO-and HO D. Hsa and H20, OH-and SO- E HS04 and OH so-and Hio* 3. What is the PO l of a 0.21 M solution of weak base Pyraline CHsN?-1.4x10?at250 A)88S B)10.97 9409 D)1% E)477 For the reaction Bed+Cld2BCe, it is foand that the equiltbriam concentrations of Beds and BrCl are 0.384 M, 0.446 M, and 2.27 x 10J M, respectrely. What is the value of K? A) 7.54 x 10 B) 1.33 × 10 C) 1.20 x 104 D) 3.01 x 10 E) 3.32 ×10

Explanation / Answer

1.

(E) H3PO4 and HPO42-

Conjugate acid - base pair :

An acid - base pair which is differed by only one proton is called conjugate acid base pair.

2.

(B) A.

HSO4- and SO42-

H2O and OH-

3.

[OH-] = sqrt.(Kb*c) = sqrt.(1.4 * 10-9 * 0.21) = 1.71 * 10-5 M

pOH = -Log[OH-] = - Log[1.71 * 10-5] = 4.76

(E)

4.

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

K = (0.00227)2 / (0.384 * 0.446)

K = 3.01 * 10-5

(D)

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