8. Which conjugate acid base pair is not correct 1. Which weak acid yields a buf

Question

8. Which conjugate acid base pair is not correct 1. Which weak acid yields a buffer solution closest tp neutral pH when paired with an equal concentration ofits (A) HSO and SO conjugate base? (C HBr and Br (D) HNo, and (A) acetic acid (K.-18x10 so 9. What is the pH of a 1.4 M aqueous hypochlor solution? The Ka for hypochlorous acid is 29 (C boric acid (K. 5Ax10 (A) 0.15 (B) 3.700 (C) 3.77 10. Which sketch best represents the titration of a 2. Which salt will form a neutral aqueous solution? diprotic acid with a strong base? (A) NaF (B) (C) KBr 3. What is the ph of an aqueous solution of equal volumes of 060 M nitrous acid, HNO, and 0.30 M sodium nitrite, NaNO? The K, of HNO, is 4A6x10 (A) 5.73 (B) 4.12 (C) 3.05 2.78 Volume ofhe 4. The pH of an aqueous 000796 M solution of HIO is 2.12. What is the K of HIO? Do not assume that ionization is negligible with respect to the initial (A) 0.16 (B) 00076 (C) 0.00037 D) 021 According to Lewis theory, Lewis acid is a(n) of added mu Volume base (A) proton donor. (B) electron-pair donor 11. ldentify and justify the Bronsted-Lowry acid in th (C) proton acceptor. D electron-pair acceptor. reaction: NH, HBr NH.Br 6. Which acid is likely to result in the greatest percent ionization in aqueous solution? (A) NH, because it is a proton donor (B) HBr because it is a proton donor (A) 1 M HC.H Bro: K. 13x103 (C) NH, because it is a proton acceptor (D) HBr because it is a proton acceptor do M HIO: K. 3.2x10 12. Which two elements form a compound with the stoichiometry X:Y,? (D) 1 M Hess; K 1.0x10 10x10 7. A buffer solution consists of 0.100 mol of acetic acid (pK. 4.74) and 0.100 mol of sodium acetate in 1.00 L of aqueous solution. How much will the pH increase if 0.010 mol of NaoH is added to the solution? (Assume that the volume remains constant.) (A) 0.040 (B) 0,087 (C) 0.15 D) 0.22

Explanation / Answer

2) C = KBr

KBr is formed from strong base KOH and strong acid HBr. So, aqueous solution of KBr is neutral.

3) pH = pKa + log [NaNO2]/[HNO2]

= -logKa + log [NaNO2]/[HNO2]

= -log(4.46x 10-4) + log (0.3/0.6)

= 3.05

Therefore,

pH = 3.05

5) Lewis acid = electron -pair acceptor

8) A

Conjugate base of H2SO4 = HSO4-

Therefore, H2SO4 and SO42- is not a conjugate acid-base pair.

12) D

Al2O3

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