18.用H3PO4(pKa1 = 2.16,pKa2 = 7.21,pKa3 = 12.32)18.用H3PO4(pKa1 = 2.16,pKa2 = 7.21,pKa3 = 12.32)和NaOH配成的pH = 7.0的缓冲溶液中,抗酸成分是 A H2PO4- B HPO42- C H3PO4 D PO43-

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18.用H3PO4(pKa1 = 2.16,pKa2 = 7.21,pKa3 = 12.32)18.用H3PO4(pKa1 = 2.16,pKa2 = 7.21,pKa3 = 12.32)和NaOH配成的pH = 7.0的缓冲溶液中,抗酸成分是 A H2PO4- B HPO42- C H3PO4 D PO43-
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18.用H3PO4(pKa1 = 2.16,pKa2 = 7.21,pKa3 = 12.32)18.用H3PO4(pKa1 = 2.16,pKa2 = 7.21,pKa3 = 12.32)和NaOH配成的pH = 7.0的缓冲溶液中,抗酸成分是 A H2PO4- B HPO42- C H3PO4 D PO43-
18.用H3PO4(pKa1 = 2.16,pKa2 = 7.21,pKa3 = 12.32)
18.用H3PO4(pKa1 = 2.16,pKa2 = 7.21,pKa3 = 12.32)和NaOH配成的pH = 7.0的缓冲溶液中,抗酸成分是
A H2PO4- B HPO42- C H3PO4 D PO43-

18.用H3PO4(pKa1 = 2.16,pKa2 = 7.21,pKa3 = 12.32)18.用H3PO4(pKa1 = 2.16,pKa2 = 7.21,pKa3 = 12.32)和NaOH配成的pH = 7.0的缓冲溶液中,抗酸成分是 A H2PO4- B HPO42- C H3PO4 D PO43-
这个题想问你ph=7时所涉及的缓冲对.根据缓冲范围为pKa±1,那么只有pKa2有资格配制pH=7.0的缓冲溶液,所以溶液的缓冲对为H2PO4 -/HPO4 2- 前面是共轭酸,后面是共轭碱,抗酸成分是共轭碱HPO4 2- 所以选B 记住,缓冲范围是缓冲比为0.1---10的溶液pH范围,也就是pKa±1. 最近好多人问到了这个问题

18.用H3PO4(pKa1 = 2.16,pKa2 = 7.21,pKa3 = 12.32)18.用H3PO4(pKa1 = 2.16,pKa2 = 7.21,pKa3 = 12.32)和NaOH配成的pH = 7.0的缓冲溶液中,抗酸成分是 A H2PO4- B HPO42- C H3PO4 D PO43- 急问大学分析化学:用NaOH溶液滴定H3PO4溶液至pH = 4.7时,溶液的简化质子条件为 ((H3PO4的pKa1~pKa3分别是2.12、7.20、12.36) (A) [H3PO4] = [H2PO4-] (B) [H2PO4-] = [HPO42-] (C) [H3PO4] = [HPO42-] (D) [H3PO4] = 2[PO43-] 选 今欲用H3PO4与Na2HPO4来配制pH = 7.2的缓冲溶液,则H3PO4与Na2HPO4物质的量之比n(H3PO4)∶n(Na2HPO4)应当是()?(H3PO4的pKa1~pKa3分别是2.12,7.20,12.36) 3,为什么? 今欲用H3PO4与Na2HPO4来配制pH = 7.2的缓冲溶液,则H3PO4与Na2HPO4物质的量之比n(H3PO4)∶n(Na2HPO4)应当(H3PO4的pKa1~pKa3分别是2.12,7.20,12.36) 3,为什么? H3PO4的PKa1~pKa2分别是2.12 7.20 12.40,当PH=7.80时,溶液中主要 用0.025mol/LH3PO4和0.025mol/LNAOH来配制的PH值为12.0的缓冲溶液100ML,试计算所需H3PO4和NAOH的体积,已知PKA1=2.17,PKA2=7.20,PKA3=12.32 已知H3PO4的PKa1=2.12 PKa2=7.21 PKa3=12.67 若配置成ph=7.0的缓冲溶液应选择的A.H3PO4~H2PO4-B.H2PO4-~HPO42-C.HPO42-~PO43-D.H3PO4~HPO42- 已知H3PO4的PKa1=2.16 PKa2=7.21 PKa3=12.32.0.01mol.Na2HPO4溶液的pH约为多少 .今欲配制一pH=7.20的缓冲溶液,所用0.10 mol/L H3PO4和0.10 mol/L NaOH溶液的体积比是( )(H3PO4:pKa1=2.16,pKa2=7.21,pKa3=12.32) 取0.1mol·L-1H3PO4 50ml和 0.1mol·L-1 NaOH 70ml混合,求溶液pH值.(已知H3PO4的pKa1=2.12;pKa2=7.21求详解、 1.今有1L含0.1mol/LH3PO4和0.30.1mol/LNaHPO4的溶液,其PH值应当是多少?(已知H3PO4的PKa1=2.12,PKa2=7.20,PKa3=12.36).2.用NaOH滴定二氯乙酸(HA,PKa=1.3)和NH4Cl混合液中的二氯乙酸至化学计量点时,其质子条件是什 已知H3PO4的pKa1 = 2.12,pKa2 = 7.20,pKa3 = 12.36.欲用磷酸盐配制缓冲溶液,若选用Na2HPO4作为碱,可配制成pH为_____至_____范围的缓冲液;若选用Na3PO4作为碱,可配制pH约为_____的缓冲液. .今欲配制一pH=7.20的缓冲溶液,所用0.10 mol/L H3PO4和0.10 mol/L NaOH溶液的体积比是( ).今欲配制一pH=7.20的缓冲溶液,所用0.10 mol/L H3PO4和0.10 mol/L NaOH溶液的体积比是( )(H3PO4:pKa1=2.16,pKa2=7.21,pKa3= 今用H3PO4和Na3PO4配制PH=7.2的缓冲溶液H3PO4与Na3PO4的物质的量之比是(H3PO4的PKa1,PKa2,PKa3分别是2.12,7.20,12.4)A,一比二 B二比三 C三比二 D,一比一 0.2mol/lH3PO4溶液与0.2mol/l的Na3PO4溶液等体积混合后溶液的PH值为H3PO4的PKa1=2.16....PKa2=7.21....pka3=12.32 大学无机化学问题 第5题怎么写?我想知道过程.H3PO4的pka1、pka2、pka3分别为2.12、7.20、12.36,当H3PO4溶液的pH=3.0时,溶液中的主要存在型体为A H2PO4- BH3PO4和H2PO4- pH=1/2(pKa1 pKa2)使用的前提条件 H3PO4+Ca(OH)2=?