Table 3 An Acid-base table Acid Name ConjugateAcid K a pK a Conjugate Base Base

Question

Table 3 An Acid-base table Acid Name ConjugateAcid Ka pKa Conjugate Base Base Name perchloric acid HClO4 >>1 < 0 ClO41- perchlorate ion hydrohalic acid HX (X=I,Br,Cl) >>1 < 0 X1- halide ion sulfuric acid H2SO4 >>1 < 0 HSO41- hydrogen sulfate ion nitric acid HNO3 >>1 < 0 NO31- nitrate ion hydronium ion H3O1+ 1.0 0.00 H2O water iodic acid HIO3 0.17 0.77 IO31- iodate ion oxalic acid H2C2O4 5.9 x 10-2 1.23 HC2O41- hydrogen oxalate ion sulfurous acid H2SO3 1.5 x 10-2 1.82 HSO31- hydrogen sulfite ion hydrogen sulfate ion HSO41- 1.2 x 10-2 1.92 SO42- sulfate ion phosphoric acid H3PO4 7.5 x 10-3 2.12 H2PO41- dihydrogen phosphate ion hydrofluoric acid HF 7.2 x 10-4 3.14 F1- fluoride ion nitrous acid HNO2 4.0 x 10-4 3.40 NO21- nitrite ion lactic acid HC3H5O3 6.4 x 10-5 3.85 C3H5O31- lactate ion formic acid HCHO2 1.8 x 10-4 3.74 CHO21- formate ion hydrogen oxalate ion HC2O41- 6.4 x 10-5 4.19 C2O42- oxalate ion hydrazoic acid HN3 1.9 x 10-5 4.72 N31- azide ion acetic acid HC2H3O2 1.8 x 10-5 4.74 C2H3O21- acetate ion carbonic acid H2CO3 4.3 x 10-7 6.37 HCO31- hydrogen carbonate ion hydrogen sulfite ion HSO31- 1.0 x 10-7 7.00 SO32- sulfite ion hydrosulfuric acid H2S 1.0 x 10-7 7.00 HS1- hydrogen sulfide ion dihydrogen phosphate ion H2PO41- 6.2 x 10-8 7.21 HPO42- hydrogen phosphate ion hypochlorous acid HClO 3.5 x 10-8 7.46 ClO1- hypochlorite ion ammonium ion NH41+ 5.6 x 10-10 9.25 NH3 ammonia hydrocyanic acid HCN 4.0 x 10-10 9.40 CN1- cyanide ion hydrogen carbonate ion HCO31- 4.7 x 10-11 10.33 CO32- carbonate ion hydrogen phosphate ion HPO42- 4.8 x 10-13 12.32 PO43- phosphate ion hydrogen sulfide ion HS1- 1.3 x 10-13 12.89 S2- sulfide ion water H2O 1.0 x 10-14 14.00 OH1- hydroxide ion ammonia NH3 <<10-14 NH21- amide ion hydroxide ion OH1- <<10-14 O2- oxide ion

Explanation / Answer

Plots V HCl vs pH

Kb 2,20E-07 KH 4,54E-08 Volumen A 45 mL Concentration 0,4 M Moles A 0,018 Before equivalence point Volumen HCl (mL) M HCl VT (mL) initials moles HCl final moles HCl final mols A Concentration A Concentration HA pOH pH 0 0,4 45 0 0 0,018 0,4 0 6,66E+00 7,34E+00 20 0,4 65 0,008 0 0,01 0,153846154 0,123076923 6,56E+00 7,44E+00 40 0,4 85 0,016 0 0,002 0,023529412 0,188235294 7,56E+00 6,44E+00 Equivalence Point pH is determined by the salt dissociation Volumen HCl (mL) M HCl VT (mL) initials moles HCl final moles HCl final mols A Concentration A Concentration HA [H3O]+ pH 45 0,4 90 0,0225 0 0 0 2,50E-04 3,38E-06 5,4710833 After equivalence point Volumen HCl (mL) M HCl VT (mL) initials moles HCl final moles HCl final mols A Concentration A Concentration HA [H3O]+ pH 50 0,4 95 0,02 0,002 0 0 0,000189474 2,11E-04 3,67669361 60 0,4 105 0,024 0,006 0 0 0,000171429 2,29E-04 3,640978057 VHCl (mL) pH 0 7,34E+00 20 7,44E+00 40 6,44E+00 45 5,4710833 50 3,67669361 60 3,640978057

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