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综合实验训练一 内容汇报 & 思考讨论 PowerPoint PPT Presentation


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综合实验训练一 内容汇报 & 思考讨论. 李黄河 金纪阳 沙高洁 汤 问. 内容提要. 一、明矾的制备和组分含量的测定、明矾的净水作用 二、三氯化六氨合钴的制备和组分含量的测定、离子构型和分裂能的测定 三、自选实验:十二钨硅酸的制备和酸性测定、催化性能表征. 一、明矾的制备和组分含量的测定与 明矾的净水作用. 1. 实验目的. ☞ 掌握酸溶法和碱溶法制备明矾的基本步骤和注意事项; ☞ 掌握差减法测定结晶水含量的方法; ☞ 复习配位滴定法、分光光度法、重量分析法测定离子含量的方法;

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综合实验训练一 内容汇报 & 思考讨论

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6136000

&


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6136000

1.


6136000

2.

Al

SO42-


6136000

1.

12gKOH30ml1g

2Al+2KOH+2H2O=2KAlO2+3H2

26mol/L

2KAlO2+H2SO4+2H2O=2Al(OH)3+K2SO4

2Al(OH)3+K2SO4+3H2SO4=2KAl(SO4)2+6H2O

3


6136000

2.

Q1

A1Al

Q2

A2


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By


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  • 1

  • 2

  • 3


6136000


6136000


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6136000

  • 3004

    Si 0.30% Cu 0.25 %

    Mg0.81.3 % Zn0.25 %

    Mn1.01.5% Fe0.7%

    0.05%


6136000


6136000

  • 1

  • 2


6136000

1.

1m1gm22802h

210min0.0002gm3

2.

=

n=


6136000

Al

1.

pH=4~5Al3+1:1515nm


6136000

2.

15g/ml 0.1250g10ml 2mol/L250ml100

20123456ml50ml0.25ml 2%5ml1:1HAcNaAc10min515nm1cm3

32.3~2.6g250ml1003ml50ml0.25ml 2%5ml1:1HAcNaAc10min515nm1cm3c(Al3+)Al


6136000

3.

Q15ml

A1

1pH=5,c(Al3+)=15g/50ml


6136000

2pHpHc(Al3+)=15g/50ml=515nmpH


6136000

310min2h

XOXOC2H5OHAl3+XOC2H5OHAlXOC2H5OHAlXOXOpH


6136000

Q21:1HAcNaAc

A2pH4~5

6H6InH2In4-HIn5-In6-pH=4~5H2In4-H2In4-

H2In4- H+ + HIn5- pKa=6.3

pHAl3+XOpHAl3+pH4~5


6136000

SO42-

1.

14~5g250ml100ml5ml 2mol/L

26gBaCl22H2O50mlBaCl240min

32~310ml

48003hBaSO4Ba


6136000

2.

Q1

A1Al3+BaSO4

Q2

A2K+Al3+Cl-Ba2+BaSO4Ba2+


6136000

1.

3100ml50ml50ml550ml0.1mol/LCuSO4I1I2I35ml0.1mol/LpH=720minI1I2I3

>>


6136000

2.pH

7100ml50ml5I5ml0.1mol/L0.1mol/LHCl1:1(CH2)6N(CH2)6NH+0.1mol/LNaOHpH23579111220minI

pH=5~9Al(OH)3Al3+AlO2-pHAl3+pHAl(OH)3AlO2-


6136000

[Aln(OH)m(SO4) ]0<m<3n


6136000


6136000


6136000

Co(NH3)6Cl3

1.


6136000

2.

Co(NH3)6Cl3

Co

Cl


6136000

Co(NH3)6Cl3

1.

()()()(1:1)


6136000

2.

()

Cl-


6136000

()

()()()(1:1)

13g350ml


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Co

1.

1Na2S2O3

K2Cr2O7KII2

Cr2O72-+6I-+14H+=2Cr3++3I2+7H2O

I2Na2S2O3

I2+2S2O32-=2I-+S4O62-

2Co

Co(NH3)63++3OH-=Co(OH)3+6NH3;

2Co(OH)3+6H++2I-=2Co2++I2

I2+2S2O32-=2I-+S4O62-


6136000

2.

1Na2S2O30.6129gK2Cr2O750ml250ml25.00ml2gKI15ml4mol/L HCl 5ml10min30mlNa2S2O32mlNa2S2O3V


6136000

3.

Q110min

A1I-O210minK2Cr2O7KI

Q2

A2I-Na2S2O3I-


6136000

CoEDTA

1.

1EDTA

2Co

Co(NH3)63++3OH-=Co(OH)3+6NH3;

Co3+H2O2Co3+Co2+2Co3++H2O2=2Co2++2H++O2

pH4EDTACo2+Co2+EDTACo2+pH=4~5ZnEDTA+


6136000

2.

1EDTA

2Zn0.4~0.5gZn100ml6mol/L5ml250ml


6136000

3Co1.0~1.3g50ml250ml25.00ml45ml10%NaOH 10ml10minpH6mol/L HNO3 5ml30% H2O2 210min50.00ml EDTA210% NaOHpH310ml 11HAcNaAcpH=4~5ZnV3Co


6136000

3.

Q1H2O2Co()Co()10min

A1H2O2


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Cl

1.

Ag++Cl-=AgClKsp=1.810-10

2Ag++CrO42-=Ag2CrO4,Ksp=1.110-12

c(Cl-)>>c(CrO42-)AgClAg+Cl-Ag+Ag2CrO4


6136000

2.

1.8~2.0g250ml25ml11%NaOH10ml 1:1(CH2)6N4(CH2)6N4H+pH=90.5ml 5%K2CrO4AgNO3VCl


6136000

Cl

1.

Ag++Cl-=AgCl

Ag++SCN-=AgSCN

Fe3++SCN-= Fe(SCN)2+


6136000

2.

Co(OH)350.00mlAg+AgClNH4SCN

3.


6136000

4.

Q1

A1Co(NH3)63+H+Co(NH3)63+Co(NH3)63+NH3Ag+AgClAg2CrO4

2~3


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Q2pH=9

A2pH6.5~10.5

CrO42-Cr2O72-c(CrO42-)Ag2CrO4

Ag+OH-AgOHAg2O


6136000

Q30.5ml 5%K2CrO4

A3

c(Ag+)=c(Cl-)= =1.310-5mol/L

c(CrO42-)= =6.010-3mol/L

CrO42-5.010-3mol/L50ml0.5ml 5%K2CrO40.1%


6136000

1.

kM=k/cc


6136000

2.

EDTACok=2.04ms/cmc=0.01826mol/LM=k/c=385MA2MA3MA3+33ClCl

MA22Cl1Cl[Co(NH3)6Cl]Cl2Cl


6136000

1.

ddd

ddd0=h0


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2.

450nm~540nmEDTACo10nm2nmAmax=476nm

0=h=hc/max=2.61eV


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1.


6136000

2.


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1.

pH22mol/L


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2.


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3.

Q:


6136000

1.

NaOHNaOHc0

pHc(H+)

[H+]=c0

3c0/4[H+]<c0

c0/2[H+]<3c0/4

c0/4[H+]<c0/2

[H+]<c0/4


6136000

2.

1pH1.11.5g50ml100ml20ml100mlpHpH=1.73

2NaOH2.0gNaOH500ml250ml812g250ml25.00ml250ml1~2NaOHV1

CNaOH=


6136000

325.00ml250ml1~2NaOHV2

c= =0.01913mol/L

pH=1.73c(H+)=0.019mol/L

c(H+)=c


6136000

1.

178

2

32.5mol/LNaOHV


6136000

4123.3%

CuSO45H2O


6136000


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