Question

Which of the following aqueous solutions are good buffer systems? a. 0.14 M barium hydroxide + 0.24 M barium bromide b. 0.27 M nitric acid +0.22 M potassium nitrate c. 0.27 M ammonium nitrate + 0.37 M ammonia d. 0.20 M acetic acid + 0.16 M sodium acetate e. 0.34 M hypochlorous acid + 0.21 M sodium hypochlorite Submit Answer 2 question attempts remaining

Answer 1

0.14 Barium hydroside + 0.24 Barium Bromide Ans: Strong Base, Common ion is barium therefore its not buffer b) 0.27 Nimi 0.27 Nitric acid t 0.22 M' potassium nitrate And so Strong its not buffer C Weak base + salt of weak base Buffer d) Weak acid & salt of weak deid 67 Ber e weak acid & its conjugate base so Buffer

KCN is salt of strong base So galt in aqueous solution will have basic PH Kako akw (4.98 1010) Kb = 1 x 10-14 Kb = 0. 204IXIO HCN CN "0.0422 0.0422.8 [x] [w] OM Xions -5 2.04 x 10 = C00422 - RJ 22 2 = 2.04 X 0.042 x 100 0.8568 x 10-6 = 0.9 256* ,-3 x=0h x = 0.92 Prom = - wg (09230 = 3.03 .. - wg (09256) 103 Pit 14 -port 149.08 = 10.96 =