garam terhiddan buffer defisiensi 2008

8/18/2019 Garam Terhiddan Buffer Defisiensi 2008

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GARAM TERHIDROLISISDAN LARUTAN BUFFER

Kimia Analitik


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Garam NaCl :

CH3COOK :

NH4Cl :

CH3COONH4 :


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GARAM TERHIDROLISIS CH3COOK :

Dalam air :

CH3COOK K + + CH3COO

H!O H+ + OH

CH3COO + H!O CH3COOH + OHKh


4/24

"CH3COOH# "OH# "H+# K $ %

"CH3COO# " H!O# "H+#

"CH3COOH# "OH#"H+#

K "H!O# $ K & $ % "CH3COO# "H+#

Kw

1/

Ka


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K w K h= --------

K a

"CH3COO# "OH

# "OH

#!

K & $ $

"CH3COO# "CH3COO#


6/24

"OH#! $ K & "CH3COO#

"OH# $ ' K ( )K a "CH3COO# *)!

,OH $ - ,K( - ,Ka - l./ "CH3COO#

,H $ - ,K( +- ,Ka + - l./ "CH3COO#

,H $- ,K( +- ,Ka + - l./ "/aram#


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8/24

C.nt.& Hit0n/ ,H lar0tan NaNO! 22!M

ika ka a5am t6r5610t $ 7 % 24

8ika ,H 9ari !72 ml lar0tanCH3COONa a9ala& $ 2 maka

t6nt0kan 16ra,a /ram /aramt6r5610t t6r9a,at 9alam lar0tan


9/24

Hit0n/ ,H lar0tan /aram Na!CO3 ika

Ka 9an Ka! 9ari a5am kar1.nat :

43 % 27 9an 7 % 2

,H $ - ,K( + - ;K ! + - l./ "Garam#

Hit0n/ ,H lar0tan Na!C!O4 2 M


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LARUTAN BUFFER Lar0tan ,6n


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T6r9iri 9ari : a5am l6ma& 9an /aramn Ba5a l6ma& 9an /aramn


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Cara ,6m10atan M6n?am,0r a5am l6ma&)1a5a

l6ma& 96n/an /aramn


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R0m05 ,H Unt0k 10@6r :CH3COOH 9an

CH3COONa

CH3COONa Na+ + CH3COO

CH3COOH H+ + CH3COO

Ka


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"H+# "CH3COO#t "H+# "/aram# Ka $ $

"CH3COOH# "a5am#

Ka "a5am# "H+# $ "/aram#


15/24

"/aram#

,H $ ,Ka + l./ "a5am#


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Unt0k 10@6r : NH4OH 9an NH4Cl

B0ktikan 1a&(a :

"/aram# ,H $ ,K( ,K1 l./ "a5am#


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C.nt.&

Hit0n/ ,H lar0tan 10@6r


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8ika k6 9alam 22 ml lar0tan


19/24

B6ra,a ,H lar0tan 10@6r


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;6m10atan Lar B0@6r

86la5kan ?ara m6m10at 3 L lar0tan10@6r a56tat 2!M 96n/an ,H 7

9ari /aram CH3COONa 9an lar0tanCH3COOH M Ka $ % 27


22/24

Ak5i 10@6r

K6mam,0an 9alam m6m,6rta&ankan,H lar0tan .l6& ,6nam1a&an a5am

ata0 1a5a Contoh :

8ika ,H L lar0tan 10@6r a56tat 23M

a9ala& 44 maka t0n0kkan 96n/an,6r&it0n/an 1a&(a ,6nam1a&an NaOH23 /ram ti9ak m6n


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Ka,a5ita5 B0@6r

K.n56ntra5i i.n H+


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C.nt.&

T6nt0kan ka,a5ita5 10@6r .5at

garam terhiddan buffer defisiensi 2008

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