Question

Consider the following data on some weak acids and weak bases: acid base name formula name formula hypochlorous acid HCO 3.0x10-8 ammonia NH; 1.8 x 10-5 acetic acid HCH,CO2 18% 10-3 pyridine CHN 1.7x10° Use this data to rank the following solutions in order of increasing pH. In other words, select a 'l' next to the solution that will have the lowest pH, a 2n the solution that will have the next lowest pH, and so on. solution 0.1 NKCIO choose one. 0.1 M NACH CO2 choose one 0.1 MCH NHC choose one 0.1 M NH Br choose one

Answer 1

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Let us Consider a weak acid HA - HO +AO HA + H2O Ka= [+30+] [-] Hare ka is the acid dissociation HA] [ho ] Const. Higher the ka value highen will be acidity. Higher the acidity lower will be pH and vice versa Similarly Higher the ko value higher will be the basicity i.e. higher will be corresponding pH Now, bar weak acid the pH = ½pKa -1/log 01 Mkelo pH = 1/2 pka - loge =-/ log ka-zloge = -1 log (3.0 x10-8)-12log (on) 7 = 3.76 +0.5 = 426 - 01 M NA CH3 Co2 pH = ½pka-½loge = - Y, 10g (1-3 410-57-4210902)Che Coches = 2.3 +0.5 = 2.82 - for weak Base - PoH='/2 pkg="/₂log to where Ko is the base dissociation consta 0.1M GHG NHCl por= ₂pkb - ½log (6. =-/2log (1.8x10-9) / log (o.l) = 4:38+0.5) = 4.88 PH= 14- poh - 9:12- 1 olm Nita BT pon = '₂ pkb - 1/2 logo 3-k_10g (1-8 x10-5)-1416964 = (2.32+0.5) = 2.81 PH= 14-poh - 11-13 so Solution PH 0.1 kc 10 0.1M NOCH3 Co2 0.1 M (5 H5NHCL O.IM NHA Br HH2