Download - 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
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"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#
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"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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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
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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#
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"/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
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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
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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