13-20 D) Phosphoric aid. Ka-7.3xo Which cone of these salts will f a fesie solut

Question

13-20

D) Phosphoric aid. Ka-7.3xo Which cone of these salts will f a fesie solution upon dissolving in water? Ct s Which one of the following salis will form an acidic solution on dissolving in water? (CI KOH (D) FeCls he H. ?on concentration inlemonjuice having apH of 2.40 ( 2S M (8) 0.38 M (C) 40 I M (D) 12 M (E) 4.0x10.) M 1s. The pH of a 5.0x 10 M CalOl) solution is 11.7 (B,20 (C) 12.0 (D) 2.3 (E) 13.3 (A) to whar ts ahe OIl ion comcentrationM HNO, solution? A) 1.9x 10" M (B) 1.0x 10 M (C) (D) 5.2x10"M 0 M (E) 10x 10 M 17. What is the pH of a 0.30 M solution of HOCI (K.-3.5 x 10 (D) 5.22 (A) 7.45(B) 6.54 (C) 7.98 (E) 3.99 What is the pH of a (E) 12.7 18. The neurotransmitter, dopamine, is a weak base with K of 8.5x 10 0.05 M aqueous dopamine solution? (A) 5.07 (B) 7.63 (C) 8.93 (D) 10.8 19. Which conjugate acid-base pair is the best choice to make a buffer at plh 6.0? (B) HC HO, and KC H.O: (Ka 1.4x10) (D) HBO, and KH BO, (Ka 58x101 20 A formate buffer contains equal volumes of 0.25 M HCHO2 and 0.40 M NaCHO2. The pKa of formic acid is 3.75. What is the pH of the buffer? A) 3.55 (B) 3.75 (C) 3.95 (D) 4.38 (E) 5.35

Explanation / Answer

13) Option D is the right answer as FeCl3 aqueous solution will form weak base Fe(OH)3 and Strong acid FeCl3

14) pH = 2.4 ====> -log[H+] = 2.4 ===> [H+] = e-2.4 = 0.0907

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