Question

15) The pH of a 0.63 M aqueous solution of hypobromous acid, HBrO, at 25°C is 4.17. What is the value of K for HBro? a) 2.0 x 10 b) 1.1 x 10 c) 1.08 x 10° d) 7.34 x 10 e) 6.8 x 10 16) The molar concentration of hydronium ion in pure water at 25°C is (á) 1.0 x 10? b) 0.00 c) 1.0 x 1024 d) 1.0 e) 7.00 117) A solution is prepared by dissolving 0.23 mol of hydrazoic acid and 0.27 mol of sodium azide in water sufficient to yield 1.00 L of solution. The addition of 0.05 mol of NaOH to this buffer solution causes the pH to increase slightly. The pH does not increase drastically because the NaOH reacts with the present in the buffer solution. The K, of hydrazoic acid is 1.9 x 10 a) H20 b) H,0* sodium azide d hydrozoic acid e) This is a buffer solution; the pH does not change upon addiction of acid or base.

Answer 1

15. HBAD - H+ + Вхо- pH = 4. 17 КЛ - 2 pH = - log [++ 4- 12 -- Log [*] Сн+] - 10-4.17 Сңt] = [вио] = 6 +61 X 10-Sm Ka = [н'] Сно] [HBeco Ко = (с. 6 х (os)? О•63 К = 3 х (о- нио]= 0•63m 4 رهرو