UNIVERSIDAD UNIVERSI DAD NACIONAL NACIONAL MAY MAYOR DE SAN MARCOS
FACULT FACULTAD AD DE QUÍMICA Q UÍMICA E INGENIERÍA INGENIER ÍA QUÍMICA PRACTICA Nº 5
“Compuestos oxigenados del azufre”
E.A.P.: Ingeniería Química
Curso: Laboratorio de Química Inorgánica
Profesora: Marcela Paz Castro
Horaro: Martes de 1:00 a 5:00 p.m.
I!"e#ra!"es:
Fe$%a &e e!"re#a:
Canc!ari "os! #riluz
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Icana'u( )spinal Pool *rancisco
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FACULTAD DE QUÍMICA E INGENIERÍA QUÍMICA TABLA DE CONTENIDO OBJETIVOS.................... ............................... ..................... ..................... ..................... ..................... ....................................... ............................ 2 MATERIALES..................... ................................ ...................... ..................... ..................... ............................................. .................................. 3 REACTIVOS.................... ............................... ..................... ..................... ..................... ................................................ ...................................... 3 DESARROLLO EXPERIMENTAL.................... ............................... ..................... ..................... ............................4 .................4
1. Prepar Preparaci ación ón de Tiosul Tiosulfat fato o de Sodio Sodio.................................................4 2. Propie Propiedad dades es redu reducto ctoras ras del del Tios Tiosul ulfat fato o ...........................................4 3. Propie Propiedad dades es Oxi Oxidan dantes tes del del Tios Tiosulf ulfato ato..................... ............................... ........................5 ..............5 4. Formación Formación del comple complejo jo de de tiosulf tiosulfato ato y su estabi estabilidad lidad................5 . !ccion !cciones es reduc reductora toras s del del iones iones SO 3"2..................... ................................ ..................... ................. .......6 6 #. $ifere $iferenci ncias as entre entre los los ione iones s sul%t sul%to o &SO3"2' y sulfato &SO 4"2'..........7 (. !cción !cción oxida oxidante nte dl dl )cido )cido sulf*ri sulf*rico co concen concentra trado do............................8
............................... ..................... ..................... ..................... ..................... ............................... .....................8 8 (.1. Parte 1+ 1+..................... ............................... ..................... ..................... ..................... ..................... ............................... .....................8 8 (.2. Parte 2+ 2+..................... ,. $is$is-re re-a -aci ción ón *m *med eda a del del /aSO /aSO4......................................................9
............................... ..................... ..................... ..................... ..................... ............................... .....................9 9 ,.1. Parte 1+ 1+..................... ............................... ..................... ..................... ..................... ..................... ............................... .....................9 9 ,.2. Parte 2+ 2+..................... CONCLUSIONES..................... ................................ ..................... ..................... ..................... ..................... ............................ ................. 10
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FACULTAD DE QUÍMICA E INGENIERÍA QUÍMICA
OBJETIVOS
Fa'ta c!'!car !(eti)!*.
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FACULTAD DE QUÍMICA E INGENIERÍA QUÍMICA
MATERIALES • • • • • • • • •
& ,ec-er! %*e% Matra/ Re0ri$era%te 1Re2(!3 Pieta c!% !rtaieta T!* T!* de e%*a! Gradi''a Pi%/a* a*! de reciitad! Pae' 'tr! REACTIVOS
• • • • • • • • • • • • • • • • • • • •
A/0re e% !')! Na+: 1't! de *!di!3 Na+4 1'0at! de *!di!3 C+;5; 1Eta%!'3 Na++: 1Ti!*'0at! de *!di!3 A',id<% =I: 1Tri!dr! de !ta*i!3 >% ? A' ? C ;C' &N 1@cid! c'!r-dric!3 P1C;:C3+ 1Acetat! de P'!,!3 A$N: 1Nitrat! de 'ata3 Na; 1;idr!Bid! de *!di!3 NaC' 1C'!rr! de *!di!3 =I 1!dat! de !ta*i!3 Na+ 1'0r! de *!di!3 aC'+ 1C'!rr! de ari!3 ;+4 1@cid! *'0ric!3 ;$+1N:3+ 1Nitrat! de 'ata3 a4 1'0at! de ari!3 Na+C: 1Car!%at! de !ta*i!3
DESARROLLO EXPERIMENTAL 1. Preparación Prepara ción de Tiosulfato Tiosulf ato de Sodio a' Proc Proced edim imie ient nto+ o+ " Aadir a % ,atra/ & $ de Na +: cri*ta'i%! c!% + ,' de
a$a de*ti'ada.
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FACULTAD DE QUÍMICA QUÍMICA E INGENIERÍA QUÍMICA "
Fi'trar 'a *!'ci<% 'e$! c!'!car'! e% a! ,ara -a*ta He !r e)a!raci<%? c!,ie%ce 'a cri*ta'i/aci<%.
b' 0eacc 0eacción ión u umic mica+ a+
Na+:1aH3 1*3
Na++:
;+
C+;5;
c' Obse Obser rac acio ione nes+ s+
Le$! de ,e/c'ar e' Na+: c!% e' a/0re e% !')!? *e r!cede a i%*ta'ar e' re0ri$era%te e' ca' c!%*ta de re2(! de ; + e' ca' dee *er a c!%trac!rrie%te 1!rHe a c!%trac!rrie%te *e !tie%e ,a!r re%di,ie%t!3? -er)ir e' c!%te%id! de' ,atra/ 1e' )!',e% *e ,a%tie%e c!%*ta%te !r acci<% de' re0ri$era%te !r re2(!3 *e !*er)a de c!'!r a,ari''! deid! a He e' a/0re *e e*t# di*!')ie%d! reacci!%ara. Le$! de 'trar c!'!car'! a a! ,ara *e !*er)ara 'a cri*ta'i/aci<% de' ti!*'0at! de *!di!.
EHi! de re2(!
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FACULTAD DE QUÍMICA E INGENIERÍA QUÍMICA
2. Propiedades Propieda des reductoras reducto ras del Tiosulfato Tiosulfa to a' Procedi Pro cedimien miento+ to+
J J J
E% % t! t! de de e%*a e%*a! ! ,e/ ,e/c' c'ar ar 5 $!ta $!ta** de de Na Na ++: a' 5K? c!% &,' de *!'ci<% de a',id<%. A 'a ,e/c' ,e/c'a a a%t a%ter eri!r i!r a$re a$re$a $arr $!ta $!ta a $!ta $!ta =I:1aH3 a' 5K. e$ir e$ir a$r a$re$a e$a%d! %d! -a*t -a*ta a He t!d! t!d! e' e' ti!*' ti!*'0at! 0at! e*te e*te !Bida !Bidad! d! *e *e eda !*er)ar e' c!'!r a/' 1!r 'a ide%ticaci<% de !d! 'ire *a%d! a',id<%3.
b' 0eacció 0ea cción n umica+ um ica+
Na++:
a',id<%
=I:
NaI1aH3
c'
Obseraciones
Le$! de a$re$ar e' ti!*'0at! *e a$re$< a',id<% e' Tri!dr! Tri!dr! de !ta*i!. N! *e '!$ra !*er)ar e' c!'!r a/' caracter*tic! de' !d! ,!'ec'ar deid! a He e' !d! ,!'ec'ar e*t# *ie%d! reducido por el tiosulfato de I+ a IJ&. P!r e''! *e a$re$a =I : -a*ta He t!d! e' ti!*'0at! *e -aa !Bidad! *e te%$a !d! ,!'ec'ar e% eBce*! e' ca' e* ide%ticad! !r e' a',id<% re*e%tad! c!'!r a/' !*cr!. C!% e*ta eBerie%cia *e c!,rea 'a* r!iedade* redct!ra* de' ti!*0at!.
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FACULTAD DE QUÍMICA E INGENIERÍA QUÍMICA
3. Propiedades Propieda des Oxidantes Oxidante s del Tiosulfato Tiosulfa to a' Proc Proced edim imie ient nto+ o+
J J J
E% % t! t! de de e%*a e%*a! ! c!' c!'!c !car ar +,' +,' de de Na Na ++: a' 5K a$re$ar $ra%a''a* de >%. A$re A$re$a $arr a' t! t! ;C ;C'' &N ca'e% ca'e%ta tarr 'a ,e ,e/c /c'a 'a.. E% 'a rea eaccci<% i<% *e *e 'i 'ier era a ;+ e' ca' *e ede ide%ticar *a%d! ae' de 'tr! -,edecid! c!% *!'ci<% de acetat! de '!,!.
b' 0eacc 0eacción ión u umic mica+ a+
Na++:1*3 ;C'
>%
; + >%C'+
Ide%ticaci<% de' ;+ 'ierad! e% 'a reacci<% ;+
P1C;:C3+
P
c' Obse Obser rac acio ione nes+ s+
Pri,er! *e ,e/c'< e' Na ++: c!% >% e' ;C'. Le$! *e r!cedi< a ca'e%tar'! taad! e% 'a arte *eri!r c!% % ae' -,edecid! c!% e' acetat! ara ide%ticar e' ; + 'ierad! e% 'a reacci<%? e' ca' reacci!%a c!% e' acetat! de '!,! 0!r,a%d! *'0r! de '!,! e' ca' *e !*er)a de c!'!r %e$r! e% e' ae'. P!r 'a 0!r,aci<% de C'!rr! de /i%c *e tie%e He e' >% *e a !Bidad! de >% a >% + !r acci<% de' ti!*'0at!. N!ta E' /i%c e* ,#* 0#ci' de !Bidar e% ,edi! #cid!
4. Formación del complejo de tiosulfato tiosulfa to y su estabilidad a' Proc Proced edim imie ient nto+ o+
J J J J J
E% % t! t! de e%*a e%*a! ! a$r a$re$a e$arr &,' &,' de de A$N A$N : .&N Le$! Le$! a$r a$re$a e$arr $!ta $!ta a $!ta $!ta :,' :,' de *!' *!'ci ci<% <% c!%c c!%ce%t e%trad rada a de Na++: 4M -a*ta He *e di*e')a e' e ' reciitad!. erter'! erter'! e% 4 t!* t!* de e%*a e%*a! ! e% e% i$a i$a'' ca%t ca%tida idad. d. A' ri, ri,er er t! t! a$r a$re$ar e$ar Na Na; ; a' 5K. 5K. A' *e$ *e$% %d! d! t! t! a$r a$re$ar e$ar Na NaC' C' a' a' 5K. 5K.
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FACULTAD DE QUÍMICA E INGENIERÍA QUÍMICA Le$! de -acer reacci!%ar e' %itrat! de 'ata c!% e' ti!*'0at! de *!di! 1-a*ta He *e di*!')i< t!d! e' reciitad!3 *e 0!r,a % c!,'e(! i%c!'!r! de ti!*'0at!. e a%a'i/< 'a e*tai'idad de e*te c!,'e(! e% di0ere%te* ,edi!* *e !*er)< '! *i$ie%te E% e' t! N & 1Medi! #*ic!3 E% re*e%cia de Na; e' c!,'e(! *e ,a%t)! e*ta'e? a He %! *e !*er)< ca,i! de c!'!r E% e' t! N + 1Medi! %etr!3 E% re*e%cia de NaC' e' c!,'e(! *e ,a%t)! e*ta'e a He %! *e !*er)< ca,i! de c!'!r. E% e' t! N : 1Medi! #cid!3 E% re*e%cia de =I e' c!,'e(! *e ,a%t)! e*ta'e a He %! *e !*er)< ca,i! de c!'!r. E% e' t! N 4 1'0r!3 E% re*e%cia de Na + e' c!,'e(! *e ,a%t)! i%e*ta'e *e 0!r,! 10a'ta a)eri$ar e% i%ter%et D3 de c!'!r ,arr<% !*cr!. !*cr!. . !cciones reductoras del iones SO3"2 a' Proc Proced edim imie ient nto+ o+
J J J
Me/c Me/c'a 'arr e% e% % % t t! ! de de e%* e%*a a! !N Na a+: *<'id! c!% ;C' ara !te%er +. Le$! e$! *a *at tra rarr +,' +,' de a$a a$a c! c!% % e' e' + !te%id! a%teri!r,e%te? 0!r,a%d! #cid! *'0r!*!. Le$! Le$! trat tratar ar e' e' #cid! #cid! *'0r *'0r!*! !*! c!% *!' *!'ci ci<% <% de de !d! !d!..
b' 0eacc 0eaccion iones es umica umicas+ s+
F!r,aci<% de' di
+;C'
+1$3
+NaC'
atraci<% de a$a c!% di
;+
Acci<% redct!ra de' i!% :J+
; +:1aH3
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FACULTAD DE QUÍMICA E INGENIERÍA QUÍMICA
#. $iferencias $iferenci as entre los iones sul%to &SO 3"2' y sulfato &SO4"2' a' Proc Proced edim imie ient nto+ o+
J J J
E% d!* d!* t t!* !* de e%*a e%*a! ! a$r a$re$ e$ar ar aC aC'' + a' 5K. A' ri, ri,er er t! t! a$r a$re$ar e$ar &,' &,' de Na+: a' *e$%d! t! a$re$ar i$a' ca%tidad de Na +4 a' 5K. *er)ar 'a di0ere%cia de reciitad!*. Aad Aadir ir a a, a,! !** t%! t%!** ;C' ;C'1cc3 a$itar. *er)ar e% c#' de '!* t!* *e de*re%de +.
b' 0eacc 0eacción ión u umic mica+ a+
F!r,aci<% de reciitad!* aC'+
Na+:
a :
+NaC'
aC'+
Na+4
a 4
+NaC'
Le$! de a$re$ar ;C' 1cc3 a:
a4 c' Obse Obser rac acio ione nes+ s+
;C' ;C'
+
aC'+
1N! -a reacci<%3
E% e' ri,er t! He c!%tie%e a' i!% *'t! *e !*er)a He tie%e 'i$era,e%te ,e%!* ca%tidad de reciitad! 'a%c! He e% e' *e$%d! t!. Le$! de a$re$ar e' ;C' *e tie%e He e' i!% *'t! reacci!%a c!% e*te 0!r,a%d! + e' ca' *e ede !*er)ar !r e' r(e! He *e r!dce? er! e' i!% *'0at! %! reacci!%a c!% e' ;C' !r e''! t!d! e' *'0at! *e de!*ita e% e % 'a arte i%0eri!r. N!ta *i 'e$! de a$re$ar ;C' a' *'t! de ari! a% Heda a'$! de reciitad! *e dee a He e' i!% *'t! *e -a !Bidad! arcia',e%te *'0atad!.
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FACULTAD DE QUÍMICA E INGENIERÍA QUÍMICA
(. !cción oxidante dl )cido sulf*rico concentrado (.1. (.1 .
Parte Par te 1+
a' Proc Proced edim imie ient nto+ o+ " E% % t! de e%*a! ca'e%tar %a )irta de c!re c!% &,' de "
;+4 c!%ce%trad!. E% 'a reacci<% *e de*re%de +? e' ca' *e ede ide%ticar !r * !'!r c!% ae' de ;$ +1N:3+.
b' 0eacc 0eacción ión u umic mica+ a+
+;+4
C1*3
+
;+4
Ide%ticaci<% de' + +
;$+1N:3+1aH3
;$ 1*3
c' Obse Obser rac acio ione nes+ s+
e '!$ra !*er)ar He e' #cid! *'0ric! c!%ce%trad! e* % e% a$e%te !Bida%te? '!$ra%d! He e' C *e !Bide -a*ta C + !*er)#%d!*e He 'a ,e/c'a %a' tie%e c!'!raci<% trHe*a !r 'a re*e%cia de' C4. E% 'a ide%ticaci<% de' di
(.2.
Parte 2+
a' Proc Proced edim imie ient nto+ o+ " E% % t! de e%*a! ca'e%tar %a $ra%a''a de /i%c c!% + ,' "
de ;+4 c!%ce%trad!. E% 'a reacci<% ta,iS% *e de*re%de +.
b' 0eacc 0eacción ión umic umica+ a+
;+4
>%1*3
+
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FACULTAD DE QUÍMICA E INGENIERÍA QUÍMICA
,. $is-re-ación $is-re-a ción *meda del /aSO 4 ,.1. ,.1 .
Parte Par te 1+
a' Proc Proced edim imie ient nto+ o+ " C!'!car e% % )a*! .5$ de a 4 " Adici!%ar & ,' de Na+C: a' +K. ;er)ir 'a ,e/c'a dra%te : "
,i%t!*. Fi'trar 'a ,e/c'a acid'a%d! c!% ;C'? adici!%ar aC' +.
b' 0eacc 0eacción ión umic umica+ a+
a41*3
Na+C:1aH3
aC :1*3
Le$! de' 'trad!? reacci<% c!% aC' + Na+41aH3 aC'+1aH3 c' Obse Obser rac acio ione nes+ s+
;C'
a 41*3
e !*er)a He e' *'0at! de ari! reacci!%a c!% e' car!%at! de *!di!? 0!r,a%d! *'0at! de *!di! ac!*!. E' ca' 'e$! de 'a 'traci<% *e -ace reacci!%ar c!% aC' + acid'ad! c!% ;C'? !*er)#%d!*e He *e )e')e a !te%er e' *'0at! de ari!.
,.2.
Parte 2+
a' Proc Proced edim imie ient nto+ o+
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FACULTAD DE QUÍMICA E INGENIERÍA QUÍMICA
CONCLUSIONES
Fa'ta c!'!car 'a* c!%c'*i!%e*