07- Acidos e Bases Polifuncionais
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Transcript of 07- Acidos e Bases Polifuncionais
![Page 1: 07- Acidos e Bases Polifuncionais](https://reader033.fdocuments.us/reader033/viewer/2022061609/55cf9bb8550346d033a7228a/html5/thumbnails/1.jpg)
ÁCIDOS E BASES POLIFUNCIONAIS
QAF – Prof. Dr. Marcelo Sousa
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Polifuncionais
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Polifuncionais
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Curva de titulação: H2A
Aproximado!!!
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Exemplo de titulação
𝐻2 𝑀+2𝐻 2𝑂⇌𝑀 2−+2𝐻 3𝑂+¿
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Cálculo dos volumes de equivalência𝐻2 𝑀+2𝑁 𝑎𝑂𝐻⇌+𝑁𝑎2 𝑀+2𝐻 2𝑂
1 2
2
22 25 0,12
50 mL0,1
25 mL e 50 mL
BA
B BA A
eq A AB
B
eq eqB B
nn
C VC V
C VV
C
V V
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0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0 100.00.00
2.00
4.00
6.00
8.00
10.00
12.00
14.00
Volume de NaOH (mL)
pH
1eqBV
2eqBV
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A – Início (H2A): VB = 0
Aproximado
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B – 1º Tampão (H2A/HA-): 0 < VB < VB
eq1
12
[ ]log
[ ]a
HApH pK
H A
2
[ ]( )
( ) ( )[ ]
( )
B B
A B
B BA A
A B
C VHA
V V
C VC VH A
V V
2
1
2
1
[ ] [ ]
14
12
a
eqB B
eqB B
HA H A
pH pK
V V
V V
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C – 1º PE (HA-): VB = VBeq1
[ ]( )
B B
A B
C VHA
V V
Aproximado
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D – 2º Tampão (HA-/A2-): VBeq1 < VB <
VBeq2
2
2
[ ]log
[ ]a
ApH pK
HA
12
1
( )[ ]
( )
( ) ( )( )[ ]
( )
eqB B B
A B
eqA A B B B
A B
C V VA
V V
C V C V VA
V V
2
2
2
[ ] [ ]
34
a
eqB B
A HA
pH pK
V V
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E – 2º PE (A2-): VB = VBeq2
Aproximado
2
2
2
2
[ ]
[ ]
[ ]2
b
A
b b b A
OHK
C OH
K K K COH
[ ]OH C
2[ ] b AOH K C
12 ( )
[ ]( )
eqB B B
A B
C V VA
V V
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F – Após o 2º PE (OH-): VB > VB
eq2
[ ]OH C
2( )[ ]
( )
eqB B B
A B
C V VOH
V V
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0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0 100.00
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
V (NaOH)
dpH
/dV
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0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0 100.00.00
2.00
4.00
6.00
8.00
10.00
12.00
14.00
Volume de NaOH (mL)
pH
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Indicadores ácido-base
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Indicadores ácido-base
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Indicadores ácido-base
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Indicadores ácido-base
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Indicadores ácido-base
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Indicadores ácido-base