C ( Vitamine C) PH 6 8 6 2 () 6 7 6 3 ( ) ( ) ( ) aq CHO aq HO CHO aq HO 6 8 6 2 () 6 7 6 3 ( ) ( ) ( ) aq CHO aq HO CHO aq HO 1 CV x x 1 CV x x f x f x 1 f CV x f x max f x x 3 ( ) f f n HO x 3 3 ( ) f f n HO HO V 3 f f x HO V 3 . f f x HO V 10 . pH f x V 1 max . 0 CV x max 1 . x CV 1 10 . . pH V CV 1 10 pH C 2 9, 77.10 1 , r éq Q K , r éq Q
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C( Vitamine C)
PH
6 8 6 2 ( ) 6 7 6 3 ( )( ) ( ) aqC H O aq H O C H O aq H O
6 8 6 2 ( ) 6 7 6 3 ( )( ) ( ) aqC H O aq H O C H O aq H O
1C V
x x 1C V x x
fx fx 1 fCV x
fx
max
fx
x
3( )f fn H O x
3
3
( )f
f
n H OH O
V3
f
f
xH O
V
3 .f fx H O V10 .pH
fx V
1 max. 0C V xmax 1.x C V
1
10 .
.
pH V
C V1
10 pH
C
29,77.10
1
,r éqQK
,r éqQ
3 6 7 6
,
6 8 6
.éq éq
r éq
éq
H O C H OQ
C H O
éq fx x
6 7 6 3( ) ( )éq éq fn C H O n H O x
6 7 6 3 10 pH
éq éqC H O H O
6 8 6 1
6 8 6 1
.éq f f
éq
n C H O C V x xC H O C
V V V
6 8 6 1 3éq éqC H O C H O
2
3
, 2
1 3
éq
r éq
éq
H OQ
C H O -
2
,
1
10
10
pH
r éq PHQ
C
4
, 1,06.10r éqQ
,r éqK Q
41,06.10K
C500
–( )HO aq
6 8 6 ( ) 6 7 6 2 ( )( ) ( )aqC H O aq HO C H O aq H O
AC
6 8 6( ) 0i éqn C H O x( ) 0i éqn HO x
6 8 6( ) ( )i in C H O n HO
,. .A A B B EC V C V
,.B B E
A
A
C VC
V
2 11,42.10 .AC mol L
m
(S)6 8 6( )A
n C H OC
V
6 8 6
6 8 6
( )( )
mn C H O
M C H O
6 8 6( ).A
mC
M C H O V
6 8 6. . ( )Am C V M C H O
0,499m g
500m mg
C500
C500C500mg
K
6 8 6 6 5 6 7 6 6 5( ) ( ) ( ) ( )C H O aq C H COO aq C H O aq C H COOH aq