método de la placa de wilhelmy

7/24/2019 Mtodo de La Placa de Wilhelmy

1/17

Mtodo de la plac

de Wilhelmy.

VIRIDIANA GUADALUPE GARCA LPEZ.

ARTURO BERMDEZ MARTNEZ.

SAL DANIEL CARRERA PREZ.

DIEGO ALEJANDRO BANDA FRAUSTO.

ABIGAIL PACHECO RANGEL.


2/17

Fenmenos superficiales.

Son aq!""o# $!n%&!no# $'#()o# !n "o# q!(n*!+,(!n!n $n-a&!n*a"&!n*! "a# &o")"a# q!#! !n)!n*+an !n "a #/!+$()(! -! #!/a+a)(%n !n*+!-o# &!-(o# no &(#)(0"!#.

E#*a# &o")"a# #! o+(!n*an !n "a #/!+$()(! -!$o+&a q! #! +!-1)a "a !n!+2'a "(0+! #/!+$()(a" a

# ,a"o+ &'n(&o.

La !n!+2'a -! "a# &o")"a# -!/!n-! -! $a)*o+!*a"!# )o&o "a na*+a"!1a -!" "'q(-o3 *!&/!+a*+a3 "a /+!#(%n3 "a# &o")"a# ,!)(na#a-!&4# -! "a /o#()(%n !n q! #! !n)!n*+an "a&o")"a# -!n*+o -!" "'q(-o.


3/17

Tensin Superficial

S! -!$(n! )o&o "a $!+1a q! !5!+)! n "'q(-o #o0+! na -!*!+&(na-a#/!+$()(! -!0(-o a "a !6(#*!n)(a -! na a*+a))(%n no )o&/!n#a-a 7a)!" (n*!+(o+ -!" &(#&o #o0+! "a# &o")"a# (n-(,(-a"!# -! "a #/!+$()(!.

La *!n#(%n #/!+$()(a" -!/!n-! -! "a na*+a"!1a -!" "'q(-o3 -!" &!-(o "! +o-!a 8 -! "a *!&/!+a*+a.

A n(,!" &()+o#)%/()o3 "a *!n#(%n #/!+$()(a" #! -!0! a q! "a# $!+1a# qa$!)*an a )a-a &o")"a #on -($!+!n*!# !n !" (n*!+(o+ -!" "'q(-o 8 !n "a#/!+$()(!. A#' !n !" #!no -! n "'q(-o )a-a &o")"a !#*4 #o&!*(-a $!+1a# -! a*+a))(%n.


4/17

Figura. 1 Orientacin de aun sistema liquid

S( !n !" !6*!+(o+ -!""'q(-o #! *(!n! n 2a#3

!6(#*(+4 na &'n(&a$!+1a a*+a)*(,a 7a)(a !"!6*!+(o+3 anq! !n "a+!a"(-a- !#*a $!+1a !#-!#/+!)(a0"! -!0(-o a"a 2+an -($!+!n)(a -!-!n#(-a-!# !n*+! !"

"'q(-o 8 !" 2a#.


5/17

Una &o")"a #(*a-a !n !" (n*!+(o+ -!"$"(-o3 !# a*+a'-a /o+ (2a" !n *o-a#

-(+!))(on!# /o+ "a# &o")"a# a-8a)!n*!# 8

#! !n)!n*+an !n !q("(0+(o.

Para las molculas que seencuentran cerca de la

superfcie, el equilibrio serompe, porque las molculas

son atradas ms por lasmolculas del lquido que por

las del aire.


6/17

La *!n#(%n #/!+$()(a"3 !# "a $!+1a #/!+$()(a" no+&a" /o+ n(-a- -! "

C8a# n(-a-!# !n !" S.I. !# !" N:&.

F!+1a +!#"*an*

Lon2(*- -on-2!n!+a "a $!

T!n#(%n#/!+$()(a".


7/17

Mtodos para medir la tensin superf

E6(#*!n ,a+(o# &*o-o# /a+a "a &!-()(%n -! "a *!n#(%n #/!+$()(a)4"!# #! /!-!n -(,(-(+ !n !#*4*()o# 8 -(n4&()o#9

E#*4*()o#

D(n4&()o#

; M*o-o -! "a /"a)a -!


8/17

A -($!+!n)(a -!" &*o-o -!"an(""o !#*! &*o-o

a*+(0(-o a


9/17

La *!n#(%n #/!+$()(a" !#*a &8 0(!n -a-a /o+ "a !)a)(%n (-!a" =a#&(!n4n2"o -! )on*a)*o (2a" a )!+o>9

Can-o #! #a n &*o-o -! -!#/+!n-(&(!n*o3 !" /+o)!-(&(!n*o !# !#!n)&(#&o q! !n !" &*o-o -!" an(""o3 /!+o !n !#*! )a#o "a !)a)(%n /+!#!n&!no+ a" .? /o+ "o q! no !# n!)!#a+(o +!a"(1a+ )o++!))(on!#.

T!n#(%n#/!+$()(a".

T+a0a5o *o*a"+!a"(1a-o /o+ !"

#(#*!&a

T+a0a5o +!a"(1a-o/o+ "a /"a)a.


10/17

Figura. !todo de la p"#il#elm$

S! *("(1a na/"a)a -!

2!o&!*+'a

+!)*an2"a+##/!n-(-a,!+*()a"&!n*! ana 0a"an1a -!

/+!)(#(%n

E" "a-o (n$!+(o+ -! "a/"a)a #! /on! !n

)on*a)*o=7o+(1on*a"&!n*!>)on "a #/!+$()(! -!""'q(-o /a+a q! #!

&o5!.

L!2o #! !5!+)!

na $!+1a ,!+*()a"#o0+! "a /"a)a /a+a"!,an*a+"a.


11/17

Figura. % !todo de la placa balance de

&uer'as

En "a /o#()(

-!" a++anq)a")"a+ !"$!+1a# !n*+!*!n#(%n q!

/a+*! 8 o*+a $!+1a -! "!,


12/17

U#a"&!n*! "a /"a)a !# -!/"a*(no "!,!&!n*! +2o#o3 -!*a" $o+&a q! !" 4n2"o -!

)on*a)*o #!a "o &4# /!q!o/o#(0"!3 8 #! /!-a #/on!+(2a" a )!+o.

La /"a)a &(-! *'/()a&!n*!3 && -! "a+2o =L> 8 3?&& -! !#/!#o+3 !n )8o )a#o!" /!+'&!*+o )o&/"!*o !# -! &&.

La 0a"an1a0a"an1a -! &an(/"a )

)(!+*o# &o-n &o*o+ "!,an*a&(!n+!2(#*+a-o+


13/17

En "a /+4)*()a #!/!-! )o"o)a+ !""'q(-o -!n*+o -!"+!)(/(!n*! ,a+(a#

7o+a# an*!# 8 -!5a+!q("(0+a+#! "a#/!+$()(!.

E#*! &*o-o /a+*()"a+&!n*!

a-a/*a-o a "o#(#*!&a# q

)on*(!n!n ##*a#+$a)*an*!# )

*(!&/o -! a-#o

/!-! #!+ "a+2


14/17

M!-()(on!#

E#*! a/a+a*o/!+&(*! *a&0(n!,a"a+ !" 4n2"o-! )on*a)*o !n*+!

n "'q(-o 8 n&a*!+(a" #%"(-o.

Ba#*a &!-(+ /+(&!+o"a *!n#(%n #/!+$()(a"

)on na /"a)a -!/"a*(no = >3 8

"!2o &!-(+"a )onna /"a)a 7!)7a -!"&a*!+(a" a !,a"a+.

La +!"a)(%n !n*+! "a#-o# $!+1a# &!-(-a#

!# )o# .

En "a /+4)*()a3 no#! /!-! *!n!+na /+!)(#(%n

&!5o+ q! K 3-(na:)&3 a"&!no# -!*+a0a5a+ !n

a*&%#$!+a (n!+*!)on /+!)a)(on!#

!6*+!&a#.

Po+ "o *a0a"an1a#

#on !n 20a"an

!)on%&()-an !" )!n

8a q! 5#*($()a n

/+!)(#(


15/17

E" &*o-o -! "a /"a)a -!


16/17

La $!+1a n!*a +!q!+(-a FF? /!+&(*! )a")"a+ "a *!n#(%n

Figura. ( !todo de la placa para medirtensin inter&acial.

E" &*o-o (&/"()a q! "a /"a&4# &o5a-a /o+ !" "'q(-o &!" "'q(-o &!no# -!n#o.

S( "a $a#! &4# -!n#a !# -! *(/o a-!n#a !# -! *(/o a)!(*!3 !" 4n2"2!n!+a" 8 #! /!-! a#&(+

Co&o !n !" )a#o -! na #/!/!-! #a+ !" &*o-o /a+a -!*!)on*a)*o &!-(an*! -o# &!-()(on

E" &*o-o (&/"()a q! "a /"a&4# &o5a-a /o+ !" "'q(-o &!" "'q(-o &!no# -!n#o.

S( "a $a#! &4# -!n#a !# -! *(/o a-!n#a !# -! *(/o a)!(*!3 !" 4n2"2!n!+a" 8 #! /!-! a#&(+

Co&o !n !" )a#o -! na #/!/!-! #a+ !" &*o-o /a+a -!*!)on*a)*o &!-(an*! -o# &!-()(on


17/17

S! )on)"8% q! "a *("(1a)(%n -! !#*! &*o-o !# !*!n#(%n #/!+$()(a" -! "o# "'q(-o#3 #(!n-o #(&("a+ a

#&!+2(!n-o /a+)(a"&!n*! "a /"a)a 8 &(-(!n-o "a $#!/a+a+ "a /"a)a -! "a #/!+$()(!. En n "'q(-o )o

*!&/!+a*+a -(#&(n(+4 # *!n#(%n #/

Ta&0(n q! "a *!n#(%n #/!+$()(a" no !# "o &(#&n o05!*o a $"o*a+ #o0+! "a #/!+$()(! -! n "

A+q'&(-!#>.

Po+ "*(&o3 #! ##/!n-! "a /"a)a -! &o-o q! !#* /aa /a+*(+ -!" /!#o #!)o 8 -!" /!#o #&!+2(-o #! /!-!&!n(#)o. E#*! /+o)!-(&(!n*o !# &8 *(" /a+a !#*-(a

&ono)a/a#3 )an-o !# n!)!#a+(o &!-(+ )a&0(o# !n

Con)"#(%n

método de la placa de wilhelmy

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