This means that H2O will be a stronger acid than NH3 which will be a stronger acid than CH4. Be careful when comparing acids and bases using this periodic trend to make sure that they have the same charge and hybridization! Example 1: You can’t compare NH4 + and H2O and say that H2O is a stronger acid.

This page titled 11.4: pKa Table is shared under a not declared license and was authored, remixed, and/or curated by Sergio Cortes.

2020年8月27日 · Aniline is substantially less basic than methylamine, as is evident by looking at the pK a values for their respective ammonium conjugate acids (remember that the lower the pKa of the conjugate acid, the weaker the base).

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

2022年7月29日 · For example, ethanol (CH3CH2OH) is representative of alcohols (ROH), and ammonia (NH3) is representative of amines (RNH2, R2NH). Therefore, identify the functional groups in the molecule and then match up these functional groups to the pKa’s in the table above.

... acid and base components of oil are simplified by RNH2, RCOOH and Quinoline. pKa of these redox couples are illustrated in Figure 8. At low pH (< 4.9), oil components are essentially...

Approximate pKa values rounded to the nearest 5th for various acids Learn with flashcards, games, and more — for free.

配位键氧的一对p电子与π 键共轭，两 个氮氧键等长，氮带正电，负电荷等分在两个氧原子上。 烃分子中的氢原子被硝基取代后的衍生 物叫做硝基化合物。 （多为人工合成） 胺类的酰化比醇类酰化容易。 亲核能力：-NH2＞-OH. ① 保护氨基或降低氨基的致活性。 例如： NH2 NHCOCH3. 推理：N上R取代越多，碱性越大？ f胺是典型的有机碱，其化学性质主要因氮原 子上的孤对电子，使胺表现出碱性和亲核性， 胺基是芳环亲电取代反应的致活基。 2-硝基丙烷 。

RNH2 + H3O + [RNH2 ][H3O ] Ka [RNH3 ] 在稀溶液中水的浓度接近于恒定，故未包括在公式中。 胺的碱性越强，越容易接受质子，它的共轭酸越不容易失去 质子，即共轭酸的酸性越弱而pKa值越大。因此，胺的碱性越强， 其共轭酸的pKa值越大。

higher pKa, higher basicity, lower acidity Preparation of amines Br NaCN CN H2/Pd or 1. LiAlH4 2. H3O+ NH 2 For 1o amines HNO3 H2SO4 NO 2 H2/Pd or Sn/HCl NH 2 N H O 1. LiAlH4 2. H2O N H NH 2 CH3-Br N+over alkylation Br NaN3 N 3 H2/Pd NH 2 + N2 azide Gabriel Amine Synthesis NH O O KOH N-K+ O O R-Br R NaOH, H2O CO 2-CO 2-+RNH 2 O + NH 2 N