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实验二十五 常见阳离子的分离与鉴定 ( 二 ) PowerPoint PPT Presentation


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实验二十五 常见阳离子的分离与鉴定 ( 二 ). 1. 学习混合离子分离的方法,进一步巩固离子鉴定的条件和方法。 2. 熟练运用常见元素 (Ag 、 Hg 、 Pb 、 Cu 、 Fe) 的化学性质。. 一、实验目的. 学习内容 : 离子混合溶液中诸组分若对鉴定不产生干扰,便可以利用特效反应直接鉴定某种离子。若共存的其它组分彼此干 扰,就要选择适当的方法消除干扰。.

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实验二十五 常见阳离子的分离与鉴定 ( 二 )

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5949237

()


5949237

1.

2.(AgHgPbCuFe)

:


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HClH2SO4NaOHNH3H2O(NH4)2CO3(NH4)2S

Ag+Hg2+Pb2+Cu2+Fe3+


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(100 mL)

Ag+Hg2+Pb2+Cu2+Fe3+(10 mgmL-1)molL-1 H2SO4(6)HNO3(6)HCl(26)HAc(62)NaOH(2)NH3H2O(6)K2CrO4(21)(5)NH4C1()Na2S(1)NaAc(1)K4Fe(CN)6(0.25)KI(1)CuSO4(0.2)NH3NH4Cl(pH=9)Na2CO3(12)[0.5 g150 mLHAc(2 molL-1)]H2S()

pH


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1NO3

36 molL-1HAcNO3-NO2-?

20

2Fe3+

0.25 molL-1 K4Fe(CN)6?


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3Ag+Pb2+Cu2+Hg2+Fe3+Ag+Pb2+

42 molL-1HCl2 molL-1HCl12 molL-1 HCl1

(1) Pb2+Ag+Pb2+ 13 min2 molL-1 K2CrO42 molL-1HAc?2 molL-1 NaOH?6 molL-1HAc?2


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(2) Ag+ 26 molL-1 NH3H2O?6 molL-1HNO3

4Pb2+Hg2+Cu2+Fe3+Pb2+Hg2+Cu2+

6 molL-11(34)2 molL-1HCl(34)0.2 molL-1155

CH3CSNH215 minH2SNH4Cl22


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(1) Hg2+Cu2+ Pb2+ 51 molL-1Na2S3 min34Na2S3NH4Cl33

(2) Cu2+ 3(45)4S141 molL-1NaAc0.25 molL-1 K4[Fe(CN)6]1?


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(3) Pb2+ 3411 molL-1NaAc11 molL-1 K2CrO4?2 molL-1 NaOH6 molL-1HAc?

(4) Hg2+ 36 molL-1H2SO4pH=35H2SO45l molL-1KI26 molL-1HClKIHCl10.2 molL-1CuSO4Na2CO3??


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1.Pb2+PbCl2

2.HgSH2SO4HCl?


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1AgClPbCl2HCl(2 molL-1)PbSHgSCuSNH4Cl()HgS?

2

(1) Ag+Cu2+Al3+Fe3+Ba2+Na+

(2) Pb2+Mn2+Zn2+Co2+Ba2+K+


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