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eda 17, what is the pOH ofa 0.0077 M KOH solution? A. 9.13 B. None of these choices is correct. ROK C. 11.89 D. 4.87 18. What is the [O1I] for a solution at 25°C that has [Hs0]- 1.22 x 103 M? A. 8.20E-5 M B. 8.20E-12 M C. 1.22E-11 M D. None of these choices is correct. E. 1.22E-17 M 19. What is the pH of a 0.30 M solution of NHC1? [Kb(NHs) 1.8 x 10-1 A. 4.63 B. 2.63 C. 4.89 D. 11.26 20. Calculate the pH of a buffer solution that contains 0.50 M benzoic acid (C6HsCO2H) and 0.40 M sodium benzoate (CsHsCOONa). [K 6.5 x 103 for benzoic acid] A. 4.09 B. 4.19 C. 3.89 D. 4.28 E. 4.49 21. A 53.0-mL sample of 0.057 M HCI is titrated with 0.057 M NaOH. What is the pH of the solution after 31.0 mL of NaOH have been added to the acid? A. 1.63 B. None of these choices is correct. C. 1.24 D. 1.83 E. 4.63

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