Question

Which of the following aqueous solutions are good buffer systems? 2reg 2reg 0.35 M acetic acid + 0.29 M sodium acetate 0.21 M nitrous acid + 0.18 M sodium nitrite 0.19 M barium hydroxide +0.26 M barium chloride 0.26 M perchloric acid + 0.18 M sodium perchlorate 00.30 M ammonium bromide + 0.33 M ammonia 2req 2req 2req Submit Answer Retry Entire Group 8 more group attempts remaining

Answer 1

Buffers are the solutions that resist change in ph. Audit suffer is a mixture of weak acid (like Cty cook : acetic acid) and salt of its conjugate base (after removal of it from acid : choo and salt CH coona) Basic buffer is a mixture of weak base ( like NHS : ammonia) and salt of its conjugate acid (aftu gain of it to base : white and salt Nhy Br) 1) 0.35 M acetio auid + 0.29 M sodium acetate Yes 1 (Choon) (chy coo Na) Acetic acid is a weak acid, its conjugate base al Loo salt of its conjugate base: cu Loona 2) 0.91 M nitrous acid + 0.18 4 sodium nitrite Yes L (HNO₃) (NaNO₂) Nitrous acid is a weak acid, its conjug ate base NO₂ - salt of its conjugate base: NaNO2 3) 0.19 M Barium hydroxide + 0.26M barium chloride No - Barium hydroxide is a strong base (Balon) : so can't act as buffer, (weak base required) 9 0.26 M perchloric acid + 0.18M sodirem perchlorate No Perchloric acid (h ou) is a strong acid so can't act as buffer. (weak acid required) 5) 0.30M ammonium bromide + 0.33 M ammonia Yes Ammonia (NH3) is weak base, its conjugate acid; what sult of its conjugate acid: NH y Br