NH4. +. NH4+. NH3. +. NH2. +. NH+. 5.2. 5.2. 0.4. 9.26. 10.8. 11.3 higher pKa higher basicity
1200 mL werd toegevoegd? pKa (HOAc) = 4
pKa (HOAc) = 475. pKb (NH3) = 4
Ammonium Formate pKa 2. 9.20. 8.2-10.2. NH4COOH. NH4. + ↔ NH3. 0.64 g. HCOOH or NH4OH. Triethylammonium Acetate (TEAA) pKa 1. 4.76. 3.8-5.8. (CH3CH2)3N:
(aq) + OH– (aq) Kb = [NH4. +][OH–] / [NH3]. For convenience the values are usually recorded as pKa or pKb values where pKa = -log Ka. In fact all acids with a ...
(NH4)2S (s) → 2[NH4]+. (aq) + S2-. (aq). However very little S2- is present in solution as the S2- ion is very basic (Kb = 1 x 105). For water pKa = 15.7 and
Bereken de pH van de oplossing die ontstaat als we 1 mol NH3 en 1 mol NH4Cl per. 500 ml oplossen. Uitwerking: NH4. + + H2O ↔ NH3 + H3O+. We passen de
pKa = “–7”. pKa = 4.8. Page 13. 1 lC. 1. pKa = 3.8. pKa = 4.8. pKa = 0.2. Page 14. pK [NH4. +. ] = 10. –9.4. . K = [CH3. COO. –. ][NH4. +. ] [CH3. COOH][NH3.
pKa = 9.25; % dissociation constant of NH4. +. 85. kH = 1631.3; % Pa/M Henry constant of NH3. 86. D_salt = [1.33
está indicada corretamente (dados pKa do NH4. + = 94
%20Base%20Strength/Table%20of%20Acids%20w%20Kas%20and%20pKas.pdf
Explique. O ácido mais forte é aquele que possui o menor pKa e sua base conjugada mais fraca. Sendo assim NH4.
equilíbrio. b) Calcule o pKa de cada ácido. c) Qual o ácido mais forte e qual o mais fraco? Justifique a sua resposta. d) Qual dos três ácidos HF
C) +NH4. D) -NH2. E) +NH2. 9) Indicar o ácido e a base conjugada de HSO4-. C) NH4+. D) NH2-. 13) Qual o pH de uma solução 0.1 M de HCl? (Nota: pKa do ...
a da espécie NH4+ é baixa; ou seja a base NH3 é uma base fraca. ?log (Ka Kb) = ?log Ka ?log Kb = pKa + Kb = pKw = 14.
está indicada corretamente (dados pKa do NH4. + = 94
NH4+. NH3. +. NH2. +. NH+. 5.2. 5.2. 0.4. 9.26. 10.8. 11.3 higher pKa higher basicity
BC: [NH4. +] = [OH. -] = x. BM: Ca = [NH4OH] + [NH4. +] a)Se Ca/Kb > 102 Alaranjado de metila e carmim índigo (pKa = 37). (indicador) (corante azul).
+ H2O ? NH4. +. + OH. -. Base 1 Ácido 2. Ácido 1. Base 2 onde a amônia NH3 (base 1) e o íon amônio
%20Base%20Strength/Table%20of%20Acids%20w%20Kas%20and%20pKas.pdf
H2SO4 HBr HI I Br HSO4 TsOH HNO3 HF O H O H O H H O H O H H O H O O O H NH H2CO3 HN 3 O H H H2S HCl Cl H F N NO3 SH TsO- HCO3 N O O-10-9-8-3 6-2 4-1 7-1 3 4 7 4 8 3 2 sulfuric acid hydroiodic acid hydrobromic acid
pKa Data Compiled by R Williams pKa Values INDEX Inorganic 2 Phenazine 24 Phosphates 3 Pyridine 25 Carboxylic acids 4 8 Pyrazine 26 Aliphatic 4 8 Aromatic 7 8 Quinoline 27 Phenols 9 Quinazoline 27 Alcohols and oxygen acids 10 11 Quinoxaline 27 Amino Acids 12 Special Nitrogen Compounds 28 Peptides 13 Hydroxylamines 28 Nitrogen Compounds 14
Buffer pKa and pH Range Values For preparation of Buffers in the pH Buffers pKa range Hydrochloric Acid - HCl 0-2 Nitric Acid - HNO 3 Perchloric Acid – HClO 4 Potassium Chloride – KCl 1 1-1 8 Oxalic Acid – C 2 H 2 O 4
pKa's of CH bonds in Hydrocarbons and Carbonyl Compounds Me Me MeMe Me O X O EtEt S i-Pr O O t-BuMe Ph X Phi-Pr O O LiO O Ph Me O X O O O O O MeMe t-BuO O t-BuOMe O Ph EtO O N+Me 3 O EtO Me O O MeO OMe O O MeO S N+Me 3 O Et 2N Ph O Me 2N Me 2N O SPh N O CN Me 2NMe S O Me 2N Me O Chem206 For a comprehensive compilation of Bordwell pKa data see
pKa Table: Effect of electronegativity and resonance Acid pKaConjugate Base HCl -7 Cl- H2SO4 -4 HSO4- HNO3 -2 NO3 H CH3CH2OH-2 CH3CH2OH ity idHO cH -2 H2O OOH 5 O H HNH OH phenol OO OEtacetoacetic ester HO-H water CH3CH2OH ethanol HH HHHacetone CCHalkyne H2N-H ammonia H-HHygrogen 9 (10)H3N 10 ONa+ phenoxide e g sodium phenoxide