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UNIVERSIDAD CENTRAL DELECUADOR
INGENIERIA QUIMICA
ANALISIS QUIMICO
FRACCIONES DE ESPECIESDISOCIANTES A UN pH DADO
VALORES Y Diagramas logarími!os"# !o$!#$ra!i%$
INTEGRANTE& VINICIO 'ENALCA(AR
AAYUDANTE DE CATEDRA& ANDREAARAU)O
*+,-
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TRA'A)O AUTONOMO
O')ETIVO
Conocer y elaborar un diagrama alfa (fracción de las especies disociantes)en función de un PH dado
Conocer y elaborar un diagrama de Log de las especies disociantes enfunción de un PH dado.
,. ESPECIE /H0PO-1
,.,. DIAGRAMA DE ALFA 2 PH
El ácido fosfórico acuoso se disocia formando Iones y cada uno de los cualestiene una concentración a analizar.Por lo tanto la concentración inicial de cido fosfórico incluido al !gua seria"
Ec #$#La
fracción de cada uno de las especies presentes se denota como"
Ec #$%
&a 'ue eisten las reacciones de isociación
+¿+ H 2 PO4−1
H 3 PO4+ H 2O⇆ H ¿ Ec #$*
+¿+ HPO 4−2
H 2 PO 4−1+ H 2O⇆ H ¿ Ec #$+
+¿+ PO 4−2
HPO4−2+ H 2O⇆ H
¿ Ec #$,
-egn la de/nición de Coe/ciente de isociación se tiene las siguientesecuaciones
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Ec s #$01213
4eemplazando dic5as fórmulas para de6ar a cada especie en función de(H*P7+) tenemos"
Ec. #$8
Ec. #$#9
Ec. #$##
Entonces sustituyendo de la ecuación #$#
Ec #$#%
:inalmente 5allamos alfa i;idiendo para (H*P7+) y sacando la In;ersa
Ec #$
#*
Ec #$#+
Ec #$#,
Ec #$#0
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-e 5alla la :unción !lfa
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GRAFICA ,2,
Al3a 4F /PH1
Valor#s Al3a H0PO-
A9 A# A% A*
,.* DIAGRAMA LOGARITMICO DE CONCENTRACION
Este diagrama se elabora 5allando los ;alores de"
Log (H)< $PHLog (7H)< PH$PD
Los logaritmos de cada especie isociarte se 5alla 5aciendo unanálisis segn las condiciones acidas o alcalinas 'ue presente elmedio.
Los datos obtenidos son"
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=abla #$%atos Logaritmo C H?@ > 7H$@PoH
log>H@
log>7H@
>H*P7+@
>H%P7+$@
>HP7+$%@
>P7+$*@
log>H*P7+@
log>H%P7+$ @
log>HP7+$%@
log>P7+$*@
919 #199 #EB#+ $#+ 919 $#+19
8138E$
9+
#198E$
9,
31#0E$
#*
*18%E
$%, $*19
$+180**,3+
2#
$#%1933%8
2%#
$%+1+929,
0
91,*1#0E$9#
*1#0EB#*
$#*1, $91, $#*1,
8100E$9+
*1*0E$9,
2182E$#%
#1%#E$%* $*19
$+1+2*+,2+
00
$##1983*8
0%
$%%18#2#,
,
#19#199E$9# #EB#* $#* $#19 $#*19
819#E$9+
818#E$9,
21+*E$##
*1,2E$%% $*19
$+199*8*9*
%0
$#91#%330
890
$%#1++20%
23
#1,*1#0E$9%
*1#0EB#%
$#%1, $#1, $#%1,
21+%E$9+
%1,3E$9+
01#%E$#9
81%8E$%# $*1#
$*1,33%+8*
#3
$81%#*#33
9,,
$%919*#8+
03
%19#199E$9% #EB#% $#% $%19 $#%19
+120E$9+
,1%+E$9+
*18*E$98
#138E$#8 $*1*
$*1%393%3*
#0
$31+9,202
9,%
$#312%+,%
,3
%1,*1#0E$9*
*1#0EB##
$##1, $%1, $##1,
%1%*E$9+
2122E$9+
#13+E$93
%139E$#3 $*12
$*1#982+3+
%
$212*+032
#,0
$#21,,*++
,8
*19#199E$9* #EB## $## $*19 $##19
31**E$9,
81#2E$9+
0132E$93
*1*9E$#2 $+1#
$*19*23#3+#3
$21#0%2,2#,+
$#01+3#,#,8
*1,*1#0E$9+
*1#0EB#9
$#91, $*1, $#91,
%128E$9,
812%E$9+
%1*9E$92
*1,9E$#0 $+10
$*19#%+98#
92
$010*2*+2
3++
$#,1+,0#9
00+19 #199 #EB#9 $#9 $+19 $#919 8199E$ 8189E$ 21+*E$ *1,0E $,19 $ $ $
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E$9+ 90 9+ 92 $#,*199+%,%8
001#%8#8#
082#+1++28,
9,
+1,*1#0E$9,
*1#0EB98 $81, $+1, $81,
%130E$90
818,E$9+
%1*0E$90
*1,3E$#+ $,1,
$*199%%2%,
2%
$,10%2%##
*98
$#*1++,82
9#
,19#199E$9, #EB98 $8 $,19 $819
819%E$92
818%E$9+
21++E$90
*1,2E$#* $019
$*199*0*02
,%
$,1#%3,2,
+38
$#%1++2**
+*
pH > H?@ > 7H$@PoH
log>H@
log>7H@
>H*P7+@
>H%P7+$@
>HP7+$%@
>P7+$*@
log>H*P7+@
log>H%P7+$ @
log>HP7+$%@
log>P7+$*@
,1,*1#0E$90
*1#0EB93 $31, $,1, $31,
%13#E$92
8122E$9+
%1*%E$9,
*1,%E$#% $010
$*19#9*9#3
8*
$+10*,%+9
0*
$##1+,*88
8+
019#199E$90 #EB93 $3 $019 $319
31+0E$93
81*9E$9+
0183E$9,
*1*,E$## $21#
$*19*#++,%
9+
$+1#,0*3*
8+#
$#91+2,#+
%2
01,*1#0E$92
*#0%%222 $21, $01, $21,
%1*%E$93
3193E$9+
#18%E$9+
%18#E$#9 $210
$*198%+*83
33
$*12#2*23
0%+
$81,*0#*2
*8
219 #199E$92 #9999999 $2 $219 $219 ,1#8E$98 ,12#E$9+ +1%8E$9+ %190E$98 $31*
$
*1%+*9+##83
$
*1*028288*,
$
310302*32
21,*1#0E$93
*#0%%23 $01, $21, $01,
31,*E$#9
%182E$9+
219*E$9+
#192E$93 $81#
$*1,%23,+8
8,
$*1#,%28*
2*%
$2182#,,%
+8319 #199
E$93#99999
9$0 $319 $019 #192E$
#9#1#3E$
9+313%E$
9++1%+E
$93$#919 $
*18%8+*2*$
*19,+*20$
21*2*#*+
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0, #9% 30
31,*1#0E$98
*#0%%213 $,1, $31, $,1,
#1#0E$##
+19,E$9,
81,8E$9+
#1+0E$92 $#918
$+1*8*909+
0#
$*19#2888
#83
$013*02,2
80
819#199E$98 #99999 $, $819 $,19
#1%9E$#%
#1*%E$9,
8130E$9+
+12*E$92 $##18
$+133#9#8%
0*
$*199,8,2
888
$01*%+2#0
20
81,
*1#0
E$#9
*#0%%1
23 $+1, $81, $+1,
#1%#E$
#*
+1#8E$
90
818+E$
9+
#1,#E
$90 $#%18
$,1*22,++,
98
$*199%+3*
%+0
$,13%#%+%
9#
#919#199E$#9 #9999 $+ $#919 $+19
#1%9E$#+
#1**E$90
818+E$9+
+122E$90 $#*18
$,13222#03
9#
$*199%0,,
,*2
$,1*%#+#+
*
#91,*1#0E$##
*#0%1%23 $*1, $#91, $*1,
#1#8E$#,
+1#,E$92
813,E$9+
#1+8E$9, $#+18
$01*3#23+#
88
$*19902%%
8*0
$+13%,+3#
2
##19#199E$## #999 $* $##19 $*19
#1#0E$#0
#1%2E$92
81,+E$9+
+1,3E$9, $#,18
$0138,+222
80
$*19%9+#0
,**
$+1**8#2,
*
pH > H?@ > 7H$@
P
oH
log
>H@
log
>7H@
>H*P7+
@
>H%P7+$
@
>HP7+$
%@
>P7+$
*@
log
>H*P7+@
log
>H%P7+$ @
log>HP7+$
%@
log>P7+$
*@
##1,*1#0E$#%
*#01%%23 $%1, $##1, $%1,
#19,E$#2
*100E$93
3103E$9+
#1*%E$9+ $#219
$21+*0+,9%
##
$*190#*33
8+3
$*1339#+2
2#
#%19#199E$#% #99 $% $#%19 $%19
31#8E$#8
819#E$98
0120E$9+
*1%+E$9+ $#31#
$319+,*%03
8#
$*1#29%0,
0%3
$*1+389%+
*8
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#%1,*1#0E$#*
*#10%%23 $#1, $#%1, $#1,
+13#E$%9
#102E$98
*182E$9+
019*E$9+ $#81*
$31220988*
98
$*1+9#9*3
9+,
$*1%#8280
3#
#*19#199E$#* #9 $# $#*19 $#19
%198E$%#
%1*9E$#9
#12%E$9+
31%3E$9+ $%912
$810*3+38*
,2
$*120*+%3
98*
$*193%#30
30
#*1,*1#0E$#+
*1#0%%23 $91, $#*1, $91,
21+8E$%*
%10#E$##
01#3E$9,
81*3E$9+ $%%1#
$#91,3+9##
#,
$+1%938+8
33%
$*19%2293
0+
#+19#199E$#+ # 9 $#+19 919
%1+2E$%+
%12%E$#%
%19+E$9,
8139E$9+ $%*10
$##1,0,%,2*+
$+1089#8093#
$*19938,+3+
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GRAFICA ,.*2, Logarimo C 43 /PH1
DIagrama Logarimo "# Co$!#$ra!io$
Log (H)
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*.,. DIAGRAMA DE ALFA 2 PH
!nálogamente al e6ercicio anterior se obtienen las siguientesecuaciones"
Ec %.#$#
Ec %.#$#
Ec %.#$#
Ec %.#$#
Ec %.#$#
Ec %.#$#
Ec %.#$#
-e obtienen los siguientes datos"
=abla %.#$#
!L:!
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pH > H?@ A9 A#
919 #199#199EB9
9 #12,E$9,
91, *1#0E$9##199EB9
9 ,1,*E$9,
#19 #199E$9##199EB9
9 #12,E$9+#1, *1#0E$9% 8188E$9# ,1,*E$9+%19 #199E$9% 8183E$9# #12,E$9*%1, *1#0E$9* 818+E$9# ,1,9E$9**19 #199E$9* 813*E$9# #12%E$9%*1, *1#0E$9+ 81+3E$9# ,1%+E$9%+19 #199E$9+ 31,#E$9# #1+8E$9#+1, *1#0E$9, 01++E$9# *1,0E$9#
,19 #199E$9, *10+E$9# 01*0E$9#,1, *1#0E$90 #1,*E$9# 31+2E$9#019 #199E$90 ,1+#E$9% 81+0E$9#01, *1#0E$92 #122E$9% 813%E$9#219 #199E$92 ,103E$9* 818+E$9#21, *1#0E$93 #139E$9* 8183E$9#319 #199E$93 ,12#E$9+ 8188E$9#
31, *1#0E$98 #13#E$9+#199EB9
9
819 #199E$98 ,12#E$9,
#199EB9
9
81, *1#0E$#9 #13#E$9,#199EB9
9
#919 #199E$#9 ,12#E$90#199EB9
9
#91, *1#0E$## #13#E$90#199EB9
9
##19 #199E$## ,12#E$92#199EB9
9
##1, *1#0E$#% #13#E$92#199EB9
9
#%19 #199E$#% ,12#E$93#199EB9
9
#%1, *1#0E$#* #13#E$93#199EB9
9
#*19 #199E$#* ,12#E$98#199EB9
9
#*1, *1#0E$#+ #13#E$98#199EB9
9
#+19 #199E$#+ ,12#E$#9#199EB9
9
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4!:IC7 %.#$#
I!4!F! !L:!
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*.*. DIAGRAMA LOGARITMICO DE CONCENTRACION
Este diagrama se elabora 5allando los ;alores de" Log (H)< $PHLog (7H)< PH$PDLos logaritmos de cada especie isociante se 5alla 5aciendo unanálisis segn las condiciones acidas o alcalinas 'ue presente elmedio.Los datos obtenidos son"
4!:IC! %.%$#
Log C H?@ > 7H$@PoH
log>H@
log>7H@ >H7Cl@ >7cl$ @
log>H7Cl@
log>7cl$ @
919 #199 #EB#+ $#+ 919 $#+19 #199E$9% #12,E$92$
%199EB99
$0120EB9
9
91,*1#0E$
9#*1#0%*EB
#* $#*1, $91, $#*1, #199E$9% ,1,*E$92$
%199EB99
$01%0EB9
9
#19#199E$
9# #EB#* $#* $#19 $#*19 #199E$9% #12,E$90$
%199EB99
$,120EB9
9
#1,*1#0E$
9%*1#0%*EB
#% $#%1, $#1, $#%1, 8188E$9* ,1,*E$90$
%199EB99
$,1%0EB9
9
%19#199E$
9% #EB#% $#% $%19 $#%19 8183E$9* #12,E$9,$
%199EB99
$+120EB9
9
%1,*1#0E$
9**1#0%*EB
## $##1, $%1, $##1, 818+E$9* ,1,9E$9,$
%199EB99
$+1%0EB9
9
*19
#199E$
9* #EB## $## $*19 $##19 813*E$9* #12%E$9+
$
%19#EB99
$*120EB9
9
*1,*1#0E$
9+*1#0%*EB
#9 $#91, $*1, $#91, 81+3E$9* ,1%+E$9+$
%19%EB99
$*1%3EB9
9
+19#199E$
9+ #EB#9 $#9 $+19 $#919 31,#E$9* #1+8E$9*$
%192EB99
$%13*EB9
9
+1,*1#0E$
9,*#0%%22
009 $81, $+1, $81, 01++E$9* *1,0E$9*$
%1#8EB99
$%1+,EB9
9
,19#199E$
9,#999999
999 $8 $,19 $819 *10+E$9* 01*0E$9*$
%1++EB99
$%1%9EB9
9,1, *1#0E$ *#0%%22 $31, $,1, $31, #1,*E$9* 31+2E$9* $ $
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90 00 %13%EB99%192EB9
9
019#199E$
90#999999
99 $3 $019 $319 ,1+#E$9+ 81+0E$9*$
*1%2EB99
$%19%EB9
9
01,*1#0E$
92*#0%%22
010 $21, $01, $21, #122E$9+ 813%E$9*$
*12,EB99$%19#EB99
219#199E$
92#999999
9 $2 $219 $219 ,103E$9, 818+E$9*$
+1%,EB99
$%199EB9
9
21,*1#0E$
93*#0%%221
00 $01, $21, $01, #139E$9, 8183E$9*$
+12+EB99
$%199EB9
9
319#199E$
93 #999999 $0 $319 $019 ,12#E$90 8188E$9*$
,1%+EB99
$%199EB9
9
31,*1#0E$
98*#0%%212
00 $,1, $31, $,1, #13#E$90 #199E$9%$
,12+EB99
$%199EB9
9
819#199E$
98 #99999 $, $819 $,19 ,12#E$92 #199E$9%$
01%+EB99
$%199EB9
9
81,*1#0E$
#9*#0%%122
00 $+1, $81, $+1, #13#E$92 #199E$9%$
012+EB99
$%199EB9
9
#919
#199E$
#9 #9999 $+ $#919 $+19 ,12#E$93 #199E$9%
$
21%+EB99
$%199EB9
9
#91,*1#0E$
##*#0%1%22
00 $*1, $#91, $*1, #13#E$93 #199E$9%$
212+EB99
$%199EB9
9
##19#199E$
## #999 $* $##19 $*19 ,12#E$98 #199E$9%$
31%+EB99
$%199EB9
9
##1,*1#0E$
#%*#01%%22
00 $%1, $##1, $%1, #13#E$98 #199E$9%$
312+EB99
$%199EB9
9
#%19
#199E$
#% #99 $% $#%19 $%19 ,12#E$#9 #199E$9%
$
81%+EB99
$%199EB9
9
#%1,*1#0E$
#**#10%%22
00 $#1, $#%1, $#1, #13#E$#9 #199E$9%$
812+EB99
$%199EB9
9
#*19#199E$
#* #9 $# $#*19 $#19 ,12#E$## #199E$9%$
#19%EB9#
$%199EB9
9
#*1,*1#0E$
#+*1#0%%22
00 $91, $#*1, $91, #13#E$## #199E$9%$
#192EB9#
$%199EB9
9
#+19 #199E$#+ # 9 $#+19 919 ,12#E$#% #199E$9% $#1#%EB9#
$
%199EB99
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GRAFICA *.*2, Logarimo C 43 /PH1
DIAGRAMA LOGARITMO DE CONCENTRACION HOCl
log H
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0. ESPECIE /H*S1
0.,. DIAGRAMA DE ALFA 2 PH
!nálogamente al e6ercicio anterior se obtienen los siguientes datos"
=abla *.#$#
!L:! H?@enomina
dor A9 A# A%
919 #199 #199EB99#199EB9
9 81,9E$93 #1%*E$%#
91, *1#0E$9# #199E$9##199EB9
9 *199E$92 #1%*E$%9
#19 #199E$9# #199E$9%#199EB9
9 81,9E$92 #1%*E$#8
#1, *1#0E$9% #199E$9*#199EB9
9 *199E$90 #1%*E$#3
%19 #199E$9% #199E$9+#199EB9
9 81,9E$90 #1%*E$#2
%1, *1#0E$9* #199E$9,
#199EB9
9 *199E$9, #1%*E$#0*19 #199E$9* #199E$90
#199EB99 81,9E$9, #1%*E$#,
*1, *1#0E$9+ #199E$92#199EB9
9 *199E$9+ #1%*E$#++19 #199E$9+ #199E$93 8188E$9# 81+8E$9+ #1%*E$#*+1, *1#0E$9, #199E$98 8182E$9# *199E$9* #1%*E$#%,19 #199E$9, #19#E$#9 818#E$9# 81+#E$9* #1%%E$##,1, *1#0E$90 #19*E$## 812#E$9# %18%E$9% #1%9E$#9019 #199E$90 #1#9E$#% 81#*E$9# 3103E$9% #1#*E$9801, *1#0E$92 #1*9E$#* 2108E$9# %1*#E$9# 81,9E$98
219 #199E$92 #18,E$#+ ,1#*E$9# +132E$9# 01**E$9321, *1#0E$93 +199E$#, %1,9E$9# 21,9E$9# *193E$92319 #199E$93 #19,E$#, 81,%E$9% 819,E$9# #1#3E$9031, *1#0E$98 *1#9E$#0 *1%%E$9% 8103E$9# *183E$90819 #199E$98 8109E$#2 #19+E$9% 8189E$9# #1%8E$9,81, *1#0E$#9 *19#E$#2 *1*%E$9* 8182E$9# +1#9E$9,#919 #199E$#9 81,#E$#3 #19,E$9* 8188E$9# #1*9E$9+#91, *1#0E$## *19#E$#3 *1**E$9+ 8188E$9# +1##E$9+##19 #199E$## 81,#E$#8 #19,E$9+ 8188E$9# #1*9E$9*##1, *1#0E$#% *19%E$#8 *1*#E$9, 8180E$9# +198E$9*
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GRAFICA 0.*2, Logarimo C 43 /PH1
DIAGRAMA LOGARITMO DE CONCENTRACION H*S
log(H)