Question

CHM 202F19 HW 9B Name Answer the q. in the spaces below. Use the back of the page if necessary. 1. Give the conjugate bases for the following Bronsted-Lowry acids: a) H2SO4 b) HNO; CHO DOH e) HPO4 Ansa) b) c) d) 2. Give the conjugate acids for the following Bronsted-Lowry bases: a) 0,2 b) HPO4? c) H2PO4 d) NH) e) NH3 Ans. a) _ d) e) 3. Calculate the pH of a 0.025 M solution of barium hydroxide. 4. Show how formic acid, HCOOH, dissociates in aqueous solution and calculate the pH of a 0.25 M solution. K = 1.8 x 104

Answer 1

sol-t Conjugate base. Acid 1) H₂SO4 11) HSO4 NO3 HNO₃ 11) HO Он- I) OH- -u) H₂PO4 Hapoy

Sol-2 Congugate acid. - base D o 11 UPO2 1) И,РО iv). NH₂ 4605 H₂ Pou Из РОy NH3. — - & NH3 - NHut Sol-3 Balon), ionises as Ba(OH) eloq, Bazt + 204 Tag. [OH-] = 2 [Boloh,] = 2X0.025 = 0.050 molt [4.30 t] = kwa [ou] = 10x10-14 5.810-2 0.2*10-12 - 2x10-13 pH = -log[4204) = -log (2x1013) = -( clog. 2-13) - -(0.3-13) = 12.7 pH value of 0.025 m of Balon) = 12.7

Sol-4 neool dissociate as Исооно - Исоо ор) + + 1. [+] = [нсоон ) - 0.25 м РИ - log [н'] - - la (25х10 = -( 2 deg 5 -2) - - (2xo. 69 -2). = -(-38 -2) 2. О.62 ри valve -90 м исоби - о -62