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MEDICIONES POTENCIOMETRICAS DE PH
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MEDICIONES POTENCIOMETRICAS DE PH
Informe de laboratorio de fisicoquimica que versa sobre el calculo experimental y teórico del potencia de hidrógeno de bases y ácidos fuertes, así com...
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UNIVERSIDAD NACIONAL MAY MAYOR DE SAN MARCOS Facultad de Ciencias Biológicas C DIGO:Lun-11h-
UNIVERSIDAD NACIONAL MAYOR DE SAN MARCOS (Unie!sidad del "e!#$ Decana de A%&!ica' FACULTAD DE CIENCIAS BIOLÓGICAS E.A.P de Ciencias Biológicas
LABORATORIO LABORATORIO DE FISICOQU!ICA PR"CTICA N#$
“Mediciones potenciometricas de PH”
P%o&eso%a' F%ancisco To%%es Dia( )o%a%io' l*nes ++,+-%s Feca de %eali(ación' +/,+0,+$
Feca de en1%ega' 2/ ,03,+$
In1eg%an1es'
ARRIDO )ACOBI$ SA*L
+,+---,.
/UAMANI BULLON$ )IMENA
+,+---0+
1ABLA 1ABLA DE CON1ENIDO CON1ENIDO
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UNIVERSIDAD NACIONAL MAY MAYOR DE SAN MARCOS de Ciencias Biológicas SECCIÓN
PÁGINA
Int!oducción
2
Resu%en
2
"!inci3ios teó!icos
4
O56etios
0
Mate!iales 7 !eactios "!ocedi%iento e83e!i%ental 1a5la 1a5la de datos datos C9lculos 7 !esultados Discusión de !esultados
0 0 . . +2
Conclusiones
+:
Cuestiona!io
+:
Bi5liog!a;
+,
A3&ndice
+,
Facultad
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UNIVERSIDAD NACIONAL MAY MAYOR DE SAN MARCOS de Ciencias Biológicas
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El 3/ es una %edida de la acide> o 5asicidad de una solución= El 3/ es la concent!ación de iones o cationes ?id!ógeno @/ 3!esentes en dete!%inada sustancia= La sigla signica 3otencial de ?id!ógeno= Al inge!i! ali%entos alte!a%os el 3/ de nuest!o cue!3o= El 3/ de nuest!o estó%ago es de +=4 de5ido al 9cido ue contiene 7 ue es #til 3a!a desco%3one! los ali%entos= Algunas co%idas 7 sus co%5inaciones co%5inaciones 3ueden 3!ooca! ue el estó%ago gene!e %9s 9cido= Si esto sucede con %uc?a ;!ecuencia$ ;!ecuencia$ el 9cido 3od!
= El 3/ de la ?u%edad del suelo a;ecta la dis3oni5ilidad de nut!ientes 3a!a las 3lantas= Muc?as 3lantas 3!ee!en un suelo lige!a%ente 9cido (3/ ent!e 4=: 7 :=:'$ %ient!as ue ot!as 3!ee!en un suelo %enos 9cido (3/ ent!e ,=: 7 0'= Los suelos alta%ente 9cidos (con un 3/ %eno! de 4=:' alcan>an concent!aciones de ele%entos u<%icos tó8icos tó8icos 3a!a las 3lantas= El 3/ del agua a;ecta la ida te!!est!e 7 acu9tica= El agua de los lagos$ lagunas 7 !
G= RESU RESUME MEN N El 3!esente in;o!%e e!sa so5!e la !eali>a!on de las %ediciones 3otencio%&t!icas e83e!i%entales del NaO/$ N/4O/$ 5uHe! 59sico$ /Cl$ C/2COO/ 7 el 5uHe! acido utili>ando el "/%et!o$ 3!eia%ente estanda!i>ado= Ade%9s$ se cont!asta!on los alo!es o5tenidos con los alo!es teó!icos 7 se ?alló su !es3ectio !ango de e!!o!= "!eia%ente se ?alla!on las concent!aciones de cada solución 3o! %edio de la titulación= En el caso del NaO/ se utili>ó co%o 3at!ón 3!i%a!io el 5i;talato de 3otasio$ en el !esto de 5ases se usó /Cl co%o 3at!ón= En el caso de los 9cidos se utili>ó la 5ase ;ue!te NaO/$ alo!ada inicial%ente$ co%o 3at!ón= Utili>ando los conoci%ientos 3!eios en JEg$ euili5!io u<%ico 7 "/ se o5tuo los datos teó!icos de este #lti%o$ es deci!$ del NaO/$ N/4O/$ 5uHe! 59sico$ /Cl$ C/2COO/ 7 el 5uHe! acidoK siendo estos estos +G=$ +G=$ ++=++$ ++=++$ =G,$ =G,$ +=-:$ +=-:$ G=.0 G=.0 7 4=04 4=04 !es3e !es3ecti ctia% a%ent ente= e= Mient! Mient!as as ue e83e! e83e!i% i%ent ental% al%ent ente e utili> utili>an ando do el "/%et "/%et!o !o se o5tuo o5tuo +G=.-$ +G=.-$ +G=2-$ +G=2-$ =,2$ =,2$ +=,-$ +=,-$ G=.+ G=.+ 7 4=20$ 4=20$ !es3e !es3ect ctia ia%e %ente nte a lo %encionado ante!io!%ente= ante!io!%ente= Se o5se!ó un 5a6o 3o!centa6e de e!!o! en todos los casos$ e8ce3to en el caso del /ClK el cual se!9 e83licado en la !es3ectia discusión de !esultados= El 5a6o 3o!centa6e de e!!o! es e83licado 3o! e!!o!es en el 3!ocedi%iento$ ale deci!$ en la titulación de soluciones 7o %ala lectu!acion del "/ %et!o=
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UNIVERSIDAD NACIONAL MAY MAYOR DE SAN MARCOS de Ciencias Biológicas
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El 3otencial de ?id!ógeno$ 3/$ es el t&!%ino ue nos indica la concent!ación de iones ?id!ógeno en una disolución= Se t!ata de una %edida de la acide> de la disolución= El t&!%ino (del ;!anc&s 4o*5oi% 3ode! e! del del ?id! ?id!óg ógen eno o'' se den dene e co%o co%o el loga loga!i !it% t%o o de la conc concen ent! t!ac ació ión n de ione ioness 6d%og7ne8 3od ?id!ógeno$ / $ ca%5iado de signo 3/ log @/ Donde @/ es la concent!ación de iones ?id!ógeno en %oles 3o! lit!o= De5ido a ue los iones / se asocian con las %ol&culas de agua 3a!a ;o!%a! iones ?id!onio$ / 2O$ el 3/ ta%5i&n se e83!esa a %enudo en t&!%inos de concent!ación de iones ?id!onio= En agua 3u!a a G: PC de te%3e!atu!a$ e8isten cantidades iguales de iones / 2O 7 de iones ?id!ó8ido (O/'K la concent!ación de cada uno es +- 0 %oleslit!o= %oleslit!o= "o! lo tanto$ el 3/ del agua 3u!a es log (+- 0'$ ue euiale a 0= Sin e%5a!go$ al aQadi!le un 9cido al agua$ se ;o!%a un e8ceso de iones / 2OK en consecuencia$ su concent!ación 3uede a!ia! ent!e +- , 7 +-+ %oleslit!o$ de3endiendo de3endiendo de la ;ue!>a 7 de la cantidad de 9cido= As<$ las disoluciones 9cidas tienen un 3/ ue a!
ación del 9cido (o 5ase' con una cantidad dete!%inada de 5ase (o 9cido' de concent!ación conocida$ en 3!esencia de un indicado! (un co%3uesto cu7o colo! a!
•
El "/%et!o
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UNIVERSIDAD NACIONAL MAY MAYOR DE SAN MARCOS de Ciencias Biológicas
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co!!iente el&ct!ica= Esto se da 3o! %edio de la %e%5!ana de id!io ue tiene el 3/ %et!o la cual o5tiene la sensi5ilidad 7 selectiidad de las dos soluciones de concent!ación= Su uso en el la5o!ato!io es 3!inci3al%ente 3a!a e! la cantidad de sales 7 sustancias o!g9nicas o!g9nicas disueltas dent!o del agua en cantidad de l<uidos de sang!e= "o! lo ue el "/ 3las%a sangu
+' Antes de cada %edida se de5e de e!ica! ue la %e%5!ana de id!io este li%3ia 7a ue si est9 con g!asa o agua 3uede a;ecta! a la %edida de solución= G' "a!a eita! daQos en el elect!odo$ de5e de %antene!se ?#%edo= "o! lo tanto$ ent!e cada %uest!a de5e de se! en6uagado con agua destilada 7 si tiene e8ceso de agua de5e de coloca!se en un 3a3el 7a ue si se utili>a un t!a3o la 3e!sona se 3uede su;!i! una ca!ga el&ct!ica=
•
La ecuación de Ne!st
Los 3otenciales no!%ales son indicado!es de ca%5ios en condiciones est9nda!= "e!o si se uie!e estudia! la tendencia de una !eacción es 3!eciso conoce! el signo 7 el alo! de en dic?as
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UNIVERSIDAD NACIONAL MAY MAYOR DE SAN MARCOS de Ciencias Biológicas
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donde es el cociente de !eacción
aO8A 5RedB aWRedA 5WO8B La !eacción se!9 es3ont9nea si D X -= Co%o D nFE 3ode%os t!ans;o!%a! la e83!esión ante!io! de la ;o!%a siguiente nFE nFET R1ln E ET (R1nF'ln Esta e83!esión es conocida co%o la ec*ación de Ne%ns1 = La ;o!%a %9s utili>ada de esta e83!esión$ a G: TC$ t!as sustitui! el alo! nu%&!ico de las constantes es E ET (-=-:n'log El 3otencial de una !eacción !edo8 es3ont9nea es 3ositio$ E -$ 7 su Z X -= "a!a una !eacción en euili5!io E - (Z -' 7 su cociente de !eacción$ $ es igual a la constante de euili5!io$ [ E - ET (R1nF'ln[ (R1nF'ln[ Eº = (RT/nF)lnK (ZT R1ln['
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UNIVERSIDAD NACIONAL MAY MAYOR DE SAN MARCOS de Ciencias Biológicas
Facultad
a' Reali>a! Reali>a! %ediciones %ediciones 3otencio%&t!icas 3otencio%&t!icas del 3/ de soluciones soluciones diluidas de 9cidos ;ue!tes ;ue!tes 7 d&5iles$ d&5iles$ 5ases ;ue!tes 7 d&5iles$ 7 5uHe!s 9cidos 7 59sicos= 5' A3li A3lica ca!! los los cono conoci ci%i %ien ento toss teó! teó!ic icos os de conc concen ent! t!ac ació ión n de solu soluci cion ones es$$ eui euili li5! 5!io io u<% u<%ic ico$ o$ euialentes 7 %edición del 3/ 3a!a el c9lculo de los %is%os= c' A3!ende! A3!ende! a usa! usa! el el 3otenc 3otenció%e ió%et!o t!o== d' "!e3a!a! soluciones 5uHe! 9cidas 9cidas 7 59sicas 59sicas de concent!ación concent!ación desconocida= e' Valo!a! soluciones soluciones 9cidas 9cidas 7 59sicas 59sicas con la t&cnica t&cnica de la la titulación= titulación=
:= MA1ER MA1ERIA IALES LES += G= 2= 4= := ,= 0= .=
"i3eta "!o3i3 o3i3et eta a Vasos de de 3!eci3 3!eci3itado itado de :- 7 +:- %l Bu!eta So3o So3o!t !te e uni unie e!s !sal al Mat! Mat!a> a> E!l E!len en%e %e7e 7e!! Fiola "oten "otenció ció%et %et!o !o 1?e!% 1?e!%o o
:= REAC REAC1I 1IVO VOS S += G= 2= 4= := ,=
\cido ;ue!te ;ue!te 7 d&5il d&5il 9cido clo!?
,= "ROCE "ROCEDI DIMI MIEN1 EN1O O
+= Se alo!ó el ?id!ó8ido ?id!ó8ido de de sodio NaO/ titulando con el 5i;talato 5i;talato de de 3otasio= G= Se 3esó el 5i;talato 7 se disolió en una 3eueQa cantidad cantidad de agua destilada= destilada=
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UNIVERSIDAD NACIONAL MAY MAYOR DE SAN MARCOS de Ciencias Biológicas M! "# $%&'l'
-=+-2 g
Slu%n#!
*lu+#n ,!'"
N+l%""
. #0.#%+#n'l
NO
:=: %l
-=-02
+G=.
Cl
=G: %l
-=---
+=,-
CCOO
+-=2 %l
-=+--G
G=.+
N2O
=0 %l
-=-G0
++=2-
3u4# 5%"
4=20
3u4# $5!%
=,2
.= CALCULOS CALCULOS Y RESUL1 RESUL1ADOS •
OB1ENCION OB1ENCION DE DE LAS CONCEN1R CONCEN1RACI ACIONES ONES DE LAS SOLU SOLUCIONE CIONES S
Facultad
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UNIVERSIDAD NACIONAL MAY MAYOR DE SAN MARCOS de Ciencias Biológicas VALORACION VALORACION DEL N/4O/
¿ Eq− g BASE =¿ Eq− g ACIDO ( N . V ) ) N H OH =( N TEOICO ) HCl TEOICO . V ) 4
N N H OH = 4
0,0956 N 0,0956 N × 9,7 ml 10 ml
N NaOH =0,0927 N 0,0927 N
VALORACION DEL /Cl
¿ Eq− g ACIDO=¿ Eq − gBASE ( N .V ) ) HCl =( N . V ) ) NaOH N HCl =
0,0927 g× 9,25 ml 10 ml
N HCl =0,0900 N
VALORACION VALORACION DEL C/2COO/
¿ Eq− g BASE =¿ Eq− g ACIDO
Facultad
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UNIVERSIDAD NACIONAL MAY MAYOR DE SAN MARCOS de Ciencias Biológicas + ¿¿
H
!H =− =−log
¿
!H =−log ( 0,0900 )
!H =1,05
Calculando el 3o!centa6e de e!!o!
(
$alo%teo%ico −$alo% e&pe%ime'tal
(
1,05−1,60 × 100 1,05
#E =
#E =
$alo% teo%ico
)
#E =52,38
"/ del NaO/
−¿¿
OH !OH =− =− log ¿
!OH =− =−log (0,0973 ) !OH =1,0119
!H !OH 14
)
× 100
Facultad
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UNIVERSIDAD NACIONAL MAY MAYOR DE SAN MARCOS de Ciencias Biológicas
(
#E =
)
12,99−12,8 × 100 12,99
#E =1,46
"/ del C/2COO/
+¿ ¿ −¿ + H
¿
CH 3 COOH COOH ( CH 3 COO
-$+--G
]
]
]
-$+--G]
]
]
2
* ) a= 0,1002− *
Se des3!ecia des3!ecia el alo! alo! de ] 7 se tiene tiene * =√ ) a × 0,1002
) a es un alo! teo!ico= −5
) a=1,8 × 10
Ree%3la>ando 1,8 × 10 × 0,1002 * =√ 1,8 −5
Facultad
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UNIVERSIDAD NACIONAL MAY MAYOR DE SAN MARCOS de Ciencias Biológicas
(
$alo%teo%ico −$alo% e&pe%ime'tal
(
2,87 −2,81 × 100 2,87
#E =
#E =
$alo% teo%ico
)
× 100
)
#E =2,09
"/ del N/4O/
−¿ + ¿ + OH ¿ N H 4 OH ( N H 4
¿
-$-G0 ] -$-G0]
]
]
]
]
Facultad
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UNIVERSIDAD NACIONAL MAY MAYOR DE SAN MARCOS de Ciencias Biológicas !OH =− =− log (1,2917 × 10
−3
)
!OH =2,89
!H + !OH =14 !H =14 −2,89
!H =11,11
Calculando el 3o!centa6e de e!!o!
(
$alo%teo%ico −$alo% e&pe%ime'tal
|
11,11−11,30 × 100 11,11
#E =
#E =
$alo% teo%ico
#E =1,71
|
)
× 100
Facultad
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UNIVERSIDAD NACIONAL MAY MAYOR DE SAN MARCOS de Ciencias Biológicas !H =9,26
Calculando el 3o!centa6e de e!!o!
(
$alo%teo%ico −$alo% e&pe%ime'tal
|
9,26− 9,63 × 100 9,26
#E =
#E =
$alo% teo%ico
)
× 100
|
#E =4
"/ del BuHe! Acido (C/ 2COO/ C/2COO/Na' !H = ! ) a+ log
([
[ SA+ ] BASE ]
( ) 0,1 N
)
Facultad
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UNIVERSIDAD NACIONAL MAY MAYOR DE SAN MARCOS de Ciencias Biológicas
Facultad
= DISCUSION DE DE RESUL1 RESUL1ADOS El 9cido ac&tico es un 9cido d&5il$ es deci! se ioni>a 3a!cial%ente en solución= "o! ello 3a!a conoce! el 3/ de la solución es necesa!io conoce! las concent!aciones en el euili5!io= Luego de esto$ se 3!ocedió a !eali>a! El 5uHe! 9cido consist
cla de una solución de un 9cido d&5il co%o el 9cido ac&tico 7 una sal ;ue!te$ el acetato de sodio= "a!a la 3!e3a!ación ;ue necesa!io encont!a! el olu%en de 9cido +0=4 N necesa!io 3a!a 3!e3a!a! +-- %l de una solución -=+ N= Luego de esto$ se 3!ocedió a encont!a! la %asa de sal necesa!ia 3a!a ue en los +-- %l 3!e3a!ados 3!eia%ente tenga una concent!ación de -=+ N= El e!!o! ?allado en la %edición el 3/ de 9cido clo!?
ó la %edición del 3/ de la solución de 9cid 9cido o ac&t ac&tic ico$ o$ se colo colocó có la %ues %uest! t!a a en un aso aso de 3!ec 3!eci3 i3it itad ado o 7 se %idi %idió ó el 3/= 3/= In%ediata%ente$ se 3!ocedió a coloca! la %uest!a de /Cl en el aso$ sin antes laa!lo adecuada%ente$ de5ido a esto conten
cla
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UNIVERSIDAD NACIONAL MAY MAYOR DE SAN MARCOS de Ciencias Biológicas
Facultad
En este caso se %e>cló una 5ase d&5il$ N H 4 OH $ 7 una sal$ N H 4 Cl $ o ta%5i&n lla%ado su acido con6ugado ;o!%9ndose ;o!%9ndose de esta %ane!a el 5uHe! 59sico= La e83licación se detalla de la %ane!a siguiente=
−¿ + ¿ + OH ¿ N H 4 OH ( N H 4
¿
-$+
-$+
8
8
8
-$+8
-$+8
8
Y la constante de de disociación asociada asociada se!9 ) b=
[ 0,1 + & ] × [ & & ] [ 0,1− & ]
[ & & ]=
[ 0,1− & ] × ) b [ 0,1 + & ]
A3lica%os _log
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UNIVERSIDAD NACIONAL MAY MAYOR DE SAN MARCOS de Ciencias Biológicas •
•
•
•
Facultad
"a!a la %edición del 3/ de soluciones de 9cidos o 5ases ;ue!tes$ se de5en usa! la ecuación del 3/= "a!a la %edición del 3/ de soluciones de 9cidos o 5ases d&5iles$ se de5en usa! los conce3tos de concent!aciones en el euili5!o 7 el [a o el [5 de la solución= "a!a la %edición del 3/ de soluciones 5uHe! 9cidas o 59sicas se de5e usa! la ecuación de /ende!son/assel5ac?= El 3otenció%et!o es un inst!u%ento ue si!e 3a!a %edi! e83e!i%ental%ente el 3/ de una solución=
++=
CUES1IONARIO
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UNIVERSIDAD NACIONAL MAY MAYOR DE SAN MARCOS de Ciencias Biológicas
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Los inst!u%entos ue se !euie!en 3a!a ?ace! %edidas 3otencio%&t!icas se lla%an elect!odos= Se usan usan 3o! 3o! 3a!e 3a!es s uno$ uno$ ue ue se lla% lla%a a de !e;e !e;e!e !enc ncia ia$$ se cons const! t!u7 u7e e de %odo %odo ue ue su 3ote 3otenc ncia iall de se%icelda 3e!%ane>ca esencial%ente constante du!ante la %edidaK el ot!o$ deno%inado indicado!$ se int!oduce en la disolución ue contiene el ion 7 es !eal%ente el ue %ide su concent!ación= "a!a ello se e%3lea un 3otenció%et!o (o olt<%et!o de alta i%3edancia'$ ue %ide el 3otencial de la 3ila ;o!%ad ;o!%ada a con a%5os a%5os elect! elect!odo odos$ s$ a3lica a3licando ndo inte! inte!na% na%ent ente e la ecuaci ecuación ón de Ne!st Ne!st 3a!a 3a!a calcul calcula! a! la concent!ación iónica ue 6ustica el alo! de 3otencial %edido=
+G= FUEN1ES CONSUL1ADAS ?tt3bbb=5ioui%ica=dogslee3=net1eo!iaa!c?iosUnidadG4=3d; ?tt3bbb=u=es5e!to%eu%ate!ial%useoinst!u3d;+-=3d; • •
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UNIVERSIDAD NACIONAL MAY MAYOR DE SAN MARCOS de Ciencias Biológicas "otenció%et!o 1?e!%o
Reactios
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UNIVERSIDAD NACIONAL MAY MAYOR DE SAN MARCOS de Ciencias Biológicas
Ro6o de %etilo Fenol;tale
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UNIVERSIDAD NACIONAL MAY MAYOR DE SAN MARCOS de Ciencias Biológicas
Valo!ación de soluciones 9cdas
Facultad
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