relative strengths acids-bases

relative strengths acids-bases - THE RELATIVE STRENGTHS OF...

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Unformatted text preview: THE RELATIVE STRENGTHS. OF ACIDS AND BASES Ka ACID BASE Large SA (3104 + H20 -* 1130+ ’+ CIO4' VWB .. H1 ~—x I' " HCI ~* c1- " H2804 "“ HSO4' u HNO3 —‘ N03' 1 1130+ é H20 "361'; """""""""" 15;"“11563‘ """"""""" :‘HSO3 """ {1% '3 0.010 HSO4' v——‘ so4~2 7.2 x 10-3 H3PO4 # H2PO4' 7 1 x10"4 HN02 ”vi N02- 6 8 x 10-4 HF : F‘ 1 8 x 10-5 HAc #— Ac- 4.5 x 10-7 H2c03 ?-=‘ HCO3 1. x 10-7 1128 # 113- 6.5 x 10-8 H803 29- 303-2 6.3 x 10-8 1121304 #— HPO4-2 62x 10-10 HCN # CN- 5 7 x 10-10 NH4+ “xi NH3 4.7 x 1011 HCO3' <——* (303-2 4 2 x 10-13 10304-2 ‘——‘ 1304-3 "TESTS—Th """" x7 {izX """ HOV—0H """ é}; """"" 1 x 10-17 HS‘ ‘- 8-2 v. Small 011- v~ 0-2 u NH3 *- NH2‘ Any solution: pH = — log[H3O+] Ka x Kb = Kw Kw = [H30+][0H-] = 1.0 x 10-14 or pH + pOH = 14.00 (at 25°C) Buffers: pH = pKa — 10g(%———gg]] = pKa + 10g<ECZ—Ai z pKa i 1. (forlO. 2 [CA]/[CB] 2 0,1) Weak acids: H3O+ ~ W (for Co >> Ka» Kw) ...
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