“Año de la diversifcación productiva y del ortalecimiento de la educación”
UNIVERSIDAD NACIONAL MAYOR DE SAN MARCOS
(Universidad del Perú, DEA!A DE A"E#$A% &AU'AD DE $E!$A) *$+'-$A) E.A.P -E!/$A 0
*$+E+'+-1A
'A)E2 'A*+#A+#$+ DE 3U$"$A -E!E#A' E $!+#-A!$A P#A$A !4 5 “P#EPA#A$! 0 6A'+#A$! DE )+'U$+!E)”
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$!E-#A!E)2 P#7$A P#7$A 5 Preparación y valoración de soluciones
D$-+2 UE6A &'+#E) A'E8A!D#A E'$9A*E: ;<;===>= A#A!DA *$''+A ?E!D0 E"A0'$!E ;<;===@5 PA8UE'+ #E0E) E$'$A $)A*E' ;<;==;= $#AD+ $#AD+ 8U'A $!-#$D A"A!DA A"A!DA ;<;===>B P#+&E)+#A2 $!-. $)A*E' #A"1#E9 FECHA DE ENTREGA: 11 DE JUNIO DE 2015
RESUMEN
En el presente traCao de laCoratorio emos aprendido mediante la eFperimentación primero a dierenciar las
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clasif5carla rlas de una manera ya sea cuantitat tativa P#7$A P#7$A Preparación y valoración de soluciones
cuando nos reerimos a diluciones y concentraciones concentraciones o tamC tamCiI iIn n median diante te pro proces cesos cual cualiitati tativo voss cuan uando aClamos de unidades Jsicas (K?% y unidades LuJmicas (molaridad y normalidad% normalidad% para Lue lueHo de identifcar estas medidas podamos continuar con el proceso de titulación Lue es lo undamental en esta última última pract practica ica la cual cual se llevó llevó a caCo toman tomando do en cuenta cuenta la valorac valoración ión del del :l a partir partir de indicad indicador ores es como como el anar naran anado de meti metillo y la en enolta ltale leJn Jna a determina determinando ndo asJ como al meGclarl meGclarlo o con el !a @+> oCtenJamos su carMcter acido o CMsico , usando la respectiva las respectivas indumentarias .
ÍNDICE $ntroducciónNNNNNNNNNNNNNNNNNNN > +CetivosNNNNNNNNNNNNNNNNNNN...... O
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NN....5 < Principios P#7$A P#7$A Preparación y valoración de soluciones
eóricosNN eóricosNNNNNNN NNNNNNNNNNN NNNNNNNNNNB NNNNB )istemas dispersosNNNNNNNNNNNNNNN...B )olucionesNNNNNNNNNNNNNNNNNN B )oluCilidadNNNNNNNNNNNNNNNNN.. ;= oncentraciónNNNNNNNNNNNNNNNN. ;; DisolucionesNNNNNNNNNNNNNNNNN ;@ "eGcla de soluciones NNNNNNNNNNNNN... ;@ !eutraliGación Mcido CaseNNNNNNNNNNN. ;> Detalles EFperimentalesNNNNNNNNNNN. NNN ;O "aterialesNNNNNNNNNNNNNNNNN... ;O #eactivosNNNNNNNNNNNNNNNNNN ;< Preparación de solución acuosa de cloruro de sodio al ;=K (?Q?%NNNNNNNNNNNNNNNNNNN ;R Preparación de una solución de cloruro de sodio al ;K en (?Q6%NNNNNNNNNNNNNNNNNNN ;R Preparación de ;==ml de una solución de !a+: aproFimadamente =,; "NNNNNNNNNNNN... ;5 Preparar ;== ml de una solución acuosa de :l =,; " a partir de :l concentradoNNNNNNNNNNNNNN..
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Pre de @<= ml de solución acuosa de P#7$A P#7$APreparación 5 paración Preparación y valoración de soluciones Na2 CO 3
=,; !NNNNNNNNNNNNNNNNNNN ;B EstandariGación EstandariGación de la solución de :l aproFimadamente =,; !NNNNNNNNNNNNNNNNNNN. @; onclusionesNNNNNNNNNNNNNNNNNN...@O #ecomendacionesNNNNNNNNNNNNNNNNN@< ApIndiceNNNNNNNNNNNNNNNNNNN...@R *iClioHraJaNNNNNNNNNNNNNNNNNN...>;
INTRODUCCIÓN El proceso de valorar o meor llamado titulación como procedimi dimie ento eFper perimenta Lue nos permite la ide identif tifcació ción a par partir tir de una solu soluci ción ón con conocida cida (solución estMndar% Lue nos sirve como patrón o Case para encontrar la concentración de otra, es un proceso Lue tiene una Hran inSuencia en mucos procesos LuJmicos y CiolóHicos, por lo Lue su conocimiento es de suma importancia . En la mayorJa de los casos
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ins instrum trume ntos como como los los pea peacim cimet etrros o como como en P#7$A P#7$A 5 ento Preparación y valoración de soluciones
nues nuestr tro o caso caso usan usando do los los indi indica cado dorres, es, cuya cuya unc unció ión n primordial es detectar el punto de eLuivalencia en las volumetrJas acidoTCa oTCasse para determinar asJ la concentración des desconocida de un Mcido en una disolución. 'os Mcidos y Cases se encuentran en nuestro entorno cotidiano en los alimentos, medicamentos, productos de limpieGa y otros tantos estMn a nivel HeneraliGado a nive nivell de la indu indusstria tria y en la cien iencia cia ya sea sea para para verifcar la manera en Lue se lleva a caCo la tra trans nsormaci mació ón de la mate materi ria a o con control troles es en el proceso de calidad de un producto, etc.
OBJETIVOS
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idePreparación ntifca fcació ción n de mater material iales es reLue reLuerid ridos os para para P#7$A P#7$A'a 5 identi y valoración de soluciones •
preparar soluciones.
•
•
6alorar el :' con una solución estMndar en este caso el !a @+>. :allar :allar las concen concentraci traciones ones de las disoluc disolucione ioness y recono conoce cerr su car carMcte Mcterr ya sea sea CMsi CMsico co o acido cido Hracias a la utiliGación de indicadores orHMnicos.
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istoria la creación de las ciencias del siHlo $2 la P#7$A P#7$A 5 dePreparación y valoración de soluciones CioloHJa, la LuJmica y la fsicoLuJmica. fsicoLuJmica.
'a fsicoLuJmica por su parte surHe como ciencia a fnales del siHlo $ y es el resultado de las inve invest stiH iHac acio ione ness de la dinM dinMmi mica ca de las las reacc eaccio ione ness ter termoLu moLuJm Jmic icas as,, la catM catMlilisi sis, s, la elec electr tról ólis isis is y, soCr soCre e todo, la Jsica de soluciones. odo ello se conuHa con la aceptación de la teorJa atomista. A principios del siHlo $ los LuJmicos pretendJan dar una eFplicación al comportamiento de los Hases a travIs de sus eFperimentos. El oCe Cetivo tivo de esto estoss estu estudi dio os era la comprensión del Mtomo. En ese entonces, omas -raam (;= (;>=T =T; ;B=;% B=;%,, un undado dadorr de la eorJa eorJa de las )oluciones, sentaron sentaron las Cases de la fsicoLuJmica como disc discip ipli lina na cien cientJ tJfc fca. a. 'os estu estudi dios os de estos LuJmicos coinciden con la Ilustración 1 Fundador de las
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El des de5scuCr cuCriimie miento de la ósmosi mosiss en memC memCra ran nas P#7$A P#7$A Preparación y valoración de soluciones semi semipe perm rmea eaCl Cles es ue ue reali ealiGa Gado do por por :enr :enrii Dutr Dutroc oce ett (;55RT;O5%, considerado como uno de los Hrandes fsióloHos del siHlo $, Luien tamCiIn tiene relación con con las las prim primer eras as oCse oCserv rvac acio ione ness Lue Lue cond condu uer eron on al descuCrimiento de la otosJntesis.
Dutr Dutroc oce ett des descuCri uCrió ó el enó enómen meno de la ósmo ósmossis cuando oCservó Lue la diusión del solvente a travIs de una memCrana semipermeaCle ocurrJa siempre de la solución de menor concentración de un soluto, Lue no puede pasar, acia la solución de mayor concentraciónW concentraciónW ademMs, el solvente Lue Suye es capaG de desarrollar una presión soCre la memCrana a la Lue denominó presión osmótica. Dutr Dutroc oce ett cons constr truy uyó ó el prim primer er disp dispos osit itiv ivo o eFper Fperim imen enta tall para para oCse oCserv rvar ar la presencia de la presión osmótica. on on lo anteri anterior ormen mente te eFpr eFpres esado ado Dutr Dutrocet ocet daCa daCa la pauta para la concepción de una cIlula viva rodeada de una memCrana semipermeaCle Lue aCsorCe aHua de sus sus alr alreded ededor ores es a trav travIs Is del del Suo Suo osmó osmóti tico co,, al mismo tiempo Lue se interrumpe la diusión de ciertas
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)acs (;>@T;B5%, en P#7$A P#7 8ulius $A 5 vonPreparación y valoración de soluciones
relación relación
al
descuCrimiento de la otosJntesis.
uriosamente, y a pesar de los antecedentes fsiolóHicos Cien conocidos de la ósmosis, PeXer no util utiliG iGó ó en sus sus eFper Fperim imen ento toss memC memCra rana nass Ciol CiolóH óHic icas as sino sino arti artif fcial ciales es,, prep prepar arad adas as en el laCo laCora rato tori rio o por por medio del depósito de un electrolito, de errocianuro de coCre soCre un dispositivo poroso. En ese entonces, las memCranas artifciales aCJan sido descuCiertas por rouCe en ;R5 y usadas eFtensivamente entre ;5= y ;B@=. on estas memCranas se consiHuieron medidas aceptaC taCles de la presión osmótica de soluciones de aGúcar y de alHunas molIculas orHMnicas, orHMnicas, loHrMndose presiones osmóticas de un poco mMs de @== atmóseras. atmóseras. En su eFperimento, PeXer utiliGó aHua como solvente y sacarosa como soluto. 'os resultados se encuentran en la HrMfca de la fHura ;. al como puede oCservarse dir directa ectame ment nte e en ella ella,, la pres presió ión n osmó osmóti tica ca de una una l ió di i l
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P#7$A P#7$A 5
Preparación y valoración de soluciones
Figura1 R!"u#$a%&" %!# !'(!ri)!*$& %! +,!-!r S! &."!r/a #a (r!"i* &")$ia %! u*a "ui* %! "aar&"a !* agua a 20C
8. :. 6anYt :oX (;<@T;B;;% ue Luien aventuró una interpretación interpretación comparativa de la presión presión osmótica con la presi esión ee eercida cida por por un Has. De esta or orma, ma, el estudio de la ósmosis se escapa de las manos de los fsióloHos y cae en las de los fsicoLuJmicos. Primero 6anYt :oX y lueHo 8osia ?illard -iCCs (;>BT;B=>% contriCuyeron a dar unidad a la teorJa de las soluciones Lue incorpora el comportamiento osmótico como una de las propiedades de las soluciones. Esta teor teorJa Ja tamC tamCiI iIn n inte inteHr Hra a los los traC traCa aos os reali ealiGa Gado doss por por
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eFplicaciones eFplicaciones mMs suHestivas de su Ipoca. 'a teorJa P#7$A P#7$A 5 Preparación y valoración de soluciones de 6anYt :oX de ;R ue resumida asJ2
oda oda materia disuelta eerce soCre una pared semipermeaCle una presión osmó osmóti tica ca iHua iHuall a la pres presió ión n Lue Lue serJ serJa a eercida en el mismo volumen, para un núme númerro iHua iHuall de molI molIcu cula lass en esta estado do Haseoso. ales ales ideas soCre la interpretación interpretación de la presión osmó osmóti tica ca Hana Hanarron Hran Hran popu popula lari rida dad. d. )in )in emCa emCarrHo, Ho, uer ueron on aCan aCando dona nada dass por por la comu comuni nida dad d cien cientJf tJfca ca a principios del siHlo por considerarse erróneas. 'a presión osmótica no es el resultado del coLue de las molIculas de la sustancia disuelta contra un taCiLue poros poroso, o, sino sino Lue su inter interpr preta etació ción n deCe deCe apreci apreciars arse e
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P#7$A P#7$A 5
Preparación y valoración de soluciones
+RINCI+IOS TEÓRICOS Si"$!)a" %i"(!r"&": 'lamados asJ, porLue en una sustancia dispersa se encuentra diseminada una sustancia dispersante .De acue acuerrdo al diM diMmetr metro o de par partJcu tJcula la dis disper persada ada, se
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'as meGclas omoHIneas se llaman soluciones, por lo P#7$A P#7$A 5 Preparación y valoración de soluciones
tanto, una solución puede defnirse como una meGcla de dos o mMs componentes en una sola ase.
'as soluciones son comunes en la naturaleGa y estMn relaci lacio onadas das con nuest uestra ra vida vida dia diaria ria, los Suido uidoss corporales de todas las ormas de vida son soluciones. soluciones. 'as 'as vari variac acio ione ness de conc concen entr trac ació ión, n, en espe especi cial al de sanH sanHrre y de orin orina, a, apor aporta tan n a los los mIdi mIdico coss vali valios osa a inormación con respecto a la salud de las personas. En una solución, por lo Heneral, el componente Lue estM en mayor proporción reciCe el nomCre de solvente (A% y el de menor proporción, proporción, es el soluto (*%. )i meGclamos : @+ y !al y oCtenemos una sola ase, entonces emos preparado una solución donde el : @+ es el solvente y el !al es el soluto. En este caso el
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P#7$A P#7$A 5
Preparación y valoración de soluciones Ilustración 2 Proceso de disolución del cloruro de
Su.i#i%a%: 'os Hases se meGclan Mcilmente entre sJ, lo acen en cualLuier cualLuier propor proporción ción y orman orman solucion soluciones es Haseosas Haseosas.. iertos pares de lJLuidos, como el metanol y aHua, tamCiIn lo acen en cualLuier proporciónW sin emCarHo, otras sustancias sustancias tienen un intervalo limitado de soluCilidad, por lo Lue Heneralmente se usa los tIrminos soluCles, escasamente soluCles e insoluCles.
Su.i Su.i#i%a #i%a%3S %3S44 representa la cantidad mMFima de soluto Lue puede disolverse en ;==H de disolverse a una una dete deterrmina minada da temp temper erat atur ura a y se dete deterrmina mina en orma eFperimental.
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P#7$A P#7$A 5
Preparación y valoración de soluciones
Cur/a" %! "u.i#i%a%
)e cons constr truy uye e con con dato datoss eFper Fperim imen ental tales es y perm permit ite e oCservar la variación de la soluCilidad de los solutos en el aHua en unción a la temperatura. 'a soluCilidad de los solutos
sólidos por lo Heneral aumenta con el aumento de la temperatura. 'a soluCilidad de los Hases
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P#7$A P#7$A 5
Preparación y valoración de soluciones
Unidades de concentración
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proc proces eso le con conoce oce como como dilu diluci ción ón,, y se usa usa las P#7$A P#7$A 5o sePreparación y valoración de soluciones siHuientes relaciones2
nsto (i% [ nsto (% "; ] 6 ; [ " @ ] 6@ 6;[!@ ]6@
o
! ; ]
M!#a %! "ui&*!"2 uando se meGclan dos soluciones Lue contiene el mismo soluto, pero de concentraciones dierentes, la
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P#7$A P#7$A 5 PF θ
Preparación y valoración de soluciones
^eLuiv. [
W PE
!Mcido ] 6 Mcido !Caase ] 6 Case =
PE [
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P#7$A P#7$A 5
; soporte universal con pinGa @ lunas de relo ; vaso de @<= m' y vaso de ;== ml ; proCeta de ;== m' > fola de ;== m' ; Cureta de <= m' @ matraces de Erlenmeyer de @<=
Preparación y valoración de soluciones
"l @ CaLuetas ; CalanGa
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P#7$A P#7$A 5
$ndicadores 2 enoltaleJna y
Preparación y valoración de soluciones
anaranado de metilo
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P#7$A P#7$A 5
Para poder poder pesar pesar los soluto solutoss
Preparación y valoración sin de tener soluciones Lue restar el peso del
vaso, se tara la CalanGa con el vaso colocado en ella. )e pres presio iona na el Cotó Cotón n +nT9 +nT9er ero o
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P#7$A P#7$A 5
Preparación y valoración de soluciones ?Q6 [
1.0 g 100 ml
_ ;==
[;
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P#7$A P#7$A 5
0.40 g
=0.01 mol !4 de moles [ 40 Preparación y valoración demol soluciones /g
'ueHo allamos la molaridad de la solución
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P#7$A P#7$A 5
W valoración de×soluciones 36.5 0.1 L
Preparación=.; y
![
W = 0.365
H
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Para titular la solución2 P#7$A P#7$A 5 Preparación y valoración de soluciones •
olocar en una Cureta @< m' de la solución de :l =,; !.
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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