已知下列弱酸pKa,试求与NaOH配制的缓冲溶液的缓冲范围。(1)硼酸(H3BO3)的pKa=9.27; (2)丙酸(CH3CH2COOH)的pKa=4.87;(3)磷酸二氢钠(NaH2PO4)的pKa=7.21; (4)甲酸(HCOOH)pKa=3.75。 A. 尊重原则 B. 不伤害原则 C. 有利原则 D. 公正原则 相关知识点: ...
CH3CH2COOH 4.88 CCl3COOH 0.65 CF3COOH 0.23下列结论不正确的是( ) A.与羧基相连的烃基具有推电子作用 B.羧酸的酸性强弱与其分子的组成和结构相关 C.可推测正丁酸的pKa比甲酸的小 D.F原子的吸引电子能力比Cl原子的强【考点】羧酸简介. 【答案】C ...
CH3 CHCH2COOHClCH2CH2CH2COOHpKa2.862.903.184.064.52可见,25℃时卤素原子对卤代饱和脂肪酸的酸性影响有(写出2条即可):①___;②___;根据上述数据和规律判断, Cl2CHCOOH的pKa的数值范围为___。附:有关有机物溶解性练习 相关知识点: 试题来源: 解析 www.ks5u.com-|||-高考资源网(1)羧基、醚...
最全有机酸碱pKa值手册.pdf,pKa Data Compiled by R. Williams 1 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
The following compounds can all react as bases. CH3CH2NH2 CH3CONH2 NaOH CH3CH2OH NaNH2 c. Rank the original compounds in order, from strongest base to weakest base. 584 Textbook Question Compare the relative acidity of 1-molar aqueous solutions of the fo...
试解释下列化合物的酸性顺序。HC≡CCH2COOH (pKa=3.32)>CH2==CHCH2COOH (pKa=4.35)>CH3CH2CH2COOH (pKa=4.8
pKa Values INDEX Inorganic2Phenazine24 Phosphates3Pyridine25 Carboxylic acids4, 8Pyrazine26 Aliphatic4, 8 Aromatic7, 8Quinoline27 Phenols9Quinazoline27 Alcohols and oxygen acids10, 11Quinoxaline27 Amino Acids12Special Nitrogen Compounds28 Peptides13Hydroxylamines28 Nitrogen Compounds14Hydrazines28 Aliphatic ...
蛋氨酸铜的制备 蛋氨酸的结构式为CH3S(CH2)2CH(NH2)COOH(相对分子质量149.15,具有二元酸的性质,其pKa1=2.22,pKa2=9.27,等电点5.74)。它能与铜离子在适当的酸度条件下,生成蛋氨酸铜螯合物沉淀。 相关知识点: 试题来源: 解析 (NH4)3H4PMo12O42·H2O+26 NaOH==12Na2MoO4+Na2HPO4+3NH3+17H2O 反馈 收藏 ...
pKa Values INDEX Inorganic2Phenazine24 Phosphates3Pyridine25 Carboxylic acids4, 8Pyrazine26 Aliphatic4, 8 Aromatic7, 8Quinoline27 Phenols9Quinazoline27 Alcohols and oxygen acids10, 11Quinoxaline27 Amino Acids12Special Nitrogen Compounds28 Peptides13Hydroxylamines28 Nitrogen Compounds14Hydrazines28 Aliphatic ...
49、itrobenz-8.0772CF3C(CH3)2OH11.664Picolin8.5072HOCH 2CF2CH2OH1164Pyrimidine-2-carbox-7.8872Primary alcohols=R?CH2?OH andSalicyl-7.4372Secondary alcohols in 50% alcoholTropo-9.0972C2F511.3565C4F911.3565C5F1111.3765C7F1511.3565Other oxygen acidsCHF212.0065Trimethylamine-n-oxide4.618CF2Cl11.6365Dimethylgl...