UNIVERSIDAD NACIONAL DE INGENIERIA FACULTAD DE INGENIERIA QUIMICA Y TEXTIL DEP DEPART ARTAM AMEN ENTO TO ACADE CADEMI MIC C QUIMICA
O DE DE ING INGEN ENIE IERI RIA A
INFORME N° 06 LABORATORIO LABORATORIO DE FISICOQUIMICA FISICOQU IMICA I QU 426 B TITULO:
TENSION SUPERFICIAL DE LIQUIDOS
ALUMNOS:
PROFESORES: Ing. Olg B!ll"n C#$%n PERIODO ACADEMICO: 2015-1
REALI&ACION REALI&ACIO N DE PRACTICA: ENTREGA DE PRACTICA:
NOTA
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INDICE
1. Objetiv Objetivos os
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' ( 2. !"#$%e"to !"#$%e"to te&'i(o te&'i(o ''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''( ). D$tos * 'es!+t$#o 'es!+t$#os s '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''') ,. Dis(!si&" Dis(!si&" #e 'es!+t$#os 'es!+t$#os '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''* 5. Obse'v$(io Obse'v$(io"es "es ''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''+0 . Co"(+!sio Co"(+!sio"es "es ''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''+0 . /ib+io /ib+io'$ '$$ $ ''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''+0
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3. P4i"$s P4i"$s eb (o"s!+t$#$s''''''''''''''''''''''''''''''''''''''''''''''''''''''''++ 6. A78"#i A78"#i(e (e
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El volumen molar
viene dado por la masa molar
y por la densidad
:
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F-g!$ 2: G$3 T%n1-/n 1!%$3-l 81 T%#%$,!$ "?1%$8#"1 5!% %l +$" -1#-n!9% "n"$#% !#%n, l ,%#%$,!$ 9 $%1%n, !n "#"$,#-%n," l-n%l % ,"" %l ,$9%," D) Cálculo del cambio cambio de de entropía entropía por por unidad unidad de área. Basándose de la siguiente ecuación:
∆ G = σ ∆ A = ∆ H −T ∆ S No se presentan reacciones químicas ( ∆ H = 0 ¿ :
∆ S −σ = ∆A T
-
Para el agua: A 27°C: 27°C:
∆ S −0.0721 N / m = =−2.4033 × 10−4 N / / K . m ∆A 300 K Seguidamente se realian los mismos procedimientos para !"°C # $"°C% resaltando todos los datos o&tenidos en ta&la:
T (°C)
∆S
( ) N
(experimental )
∆S
( ) N
(teórico )
%erro
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( )
T (°C)
∆S N (experimental ) ∆ A K . m
24
−0.9574 × 10−
( )
%error
∆S N ( teórico ) ∆ A K . m
−0.7535 × 10−
4
4
27)"$ *
.ariación de entropía por unidad de área del etanol a 2!°C) ,a&la $: .ariación
/0 Con la Ecuacin de E!t"o# calculamo# #u# re#pecti"a# con#tante# a di$erente# temperatura#. /cuación de /1tos me3orada:
σ [ V ]
2/ 3
= K e ( T c − T − 6 K )
4ónde: ,c: ,emperatura crítica de la sustancia ,: ,emperatura a la cual se encuentra la sustancia
σ : ,ensión super5icial 6: 6asa molar de la sustancia e: Constante de /1tos) 8: 4ensidad de la sustancia .: .olumen molar 4onde . 968
-
K e =
[ ][ M ρ
2/ 3
σ T C −T −6 K
]
Para el agua a 27°C:
K =
[
0.018 Kg
/ mol
2 /3
][
0.0721 N
/m
]
=1.4538∗10− J / K 7
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'
Para el etanol: T (°C)
'e. 07 'mol2& (e*perimental)
'e. 07 'mol2& (terico)
%error
2!
2)"<22
<)-+$
27*
,a&la ,a&la +: Constantes de /1tos a 2!°C)
,. Dis(!si&" #e 'es!+t$#os ' ' ' ' '
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