kestabilanionkompleks-130310100017-phpapp02
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kompleksTRANSCRIPT
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KESTABILAN IONKOMPLEKS
Diana AnisaRahmawati4301410018
Kimia KoordinasiKimia KoordinasiKimia KoordinasiKimia KoordinasiKimia
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• Analisis Kualitatif AgCl + 2NH3 [Ag(NH3)2]+ + Cl-
• Industri fotograAgBr + 2S2O3
2- [Ag(S2O3)2]3- + Br-
Arti Pntin!
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Pn!rtian Ksta"i#an
• ala! !"!#"la$ari suatu sist"! r"a%si dans"n&a'a %i!ia ada dua #"nd"%atan &ang isadiguna%an &aitu
Termodinamik senyawa kimia dapat dikatakan stabil atau tidastabil*Kin"ti% senyawa dapat dikatakan sebagai suatu senyawa
yanglabil atau sen awa inert.
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%"adaan a'al dan a%ir dari sist"!""ra#a "saran &ang diaas dala! #"nd"%atan
t"r!odina!i%a adala %onstanta %"s"ti!angan"n"rgi i%atan #ot"nsial r"du%sids, H . / S - 0/ ln K
1ntu% s"n&a'a %o!#l"%s Bilt (425)!"nggolong%an s"n&a'a %o!#l"%s !"n$adi%o!#l"%s stail dan %o!#l"%s tida% stail*
Sta"i# mam$% "rtahan
Tida& sta"i# m%dah tr%rai
Trmodinami&
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• 6"niti%"rat%an #ada !"%anis!" &ang t"r$adi #adar"a%si dan %"7"#atan "rlangsungn&a r"a%si*
• B"saran &ang "r#"ngaru 8 "n"rgi a%ti9asi %onstantala$u r"a%si dan #"!"ntu%an %o!#l"%s int"r!"diat"*
• /au" (4:;) t"la !"ng%lasi%asi%an s"n&a'a%o!#l"%s !"n$adi %o!#l"%s lail dan %o!#l"%s in"rt"rdasar%an la$u #"rtu%aran ligan %o!#l"%s t"rs"ut*
#a"i#
mn!a#ami $rt%&aran #i!an dn!an '$atinrt $rt%&aran #i!an "r#an!s%n! dn!ansan!at #am"at (tida& "r#an!s%n! samas&a#i)
Kinti&
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• Kar"na tin$auan &ang diguna%an dala! as#"%%in"ti%a dan t"r!odina!i%a "r"da !a%a u%antida% !ung%in suatu %o!#l"%s &ang stail s"7arat"r!odina!i%a $i%a ditin$au s"7ara %in"ti%a
!"ru#a%an %o!#l"%s &ang lail* S"ali%n&a suatu%o!#l"%s &ang tida% stail !ung%in sa$a !"ru#a%an%o!#l"%s in"rt*
• Sta"i#itas s%at% sn*awa "r!ant%n!
$ada nr!i ra&sin*a+ sdan!&an#a"i#itas sn*awa "r!ant%n! $adanr!i a&ti,asi dari sn*awa trs"%t)
Pn!rtian Ksta"i#an
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• Ko!#l"%s loga! t"r"ntu% dala! larutan !"lalui taa#-taa# r"a%si dan %onstanta %"s"ti!angan da#at ditulisuntu% !asing-!asing taa#* 6isaln&a untu% r"a%si#"!"ntu%an Cu(NH3)<2+ 8
Tta$an Ksta"i#an Ion Kom$#&s
Termodinamik
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• /"ta#an stailitasn&a da#at ditulis%an dala! suatu#"rsa!aan* 6isal%an #"!"ntu%an %o!#l"%s MLnt"r"ntu% !"lalui s"$u!la n taa#an* /"ta#an stailitasuntu% s"tia# taa#an t"rs"ut da#at ditulis%an s"agai"ri%ut 8
6 + = 6= K [6=]
[6][=]
6= + = 6=2 K 2 [6=2] [6=][=]6=n- + = 6=n K n [6=n]
[6=n-][=]
K 1+ K -+ .)+ K n stepwise stability constants
K 1 / K - / K 3 / ./ K n
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Tta$an Ksta"i#an Ion Kom$#&s
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6 + = 6= > [6=]
[6][=]6 + 2= 6=2 >2 [6=2]
[6][=]2
6 + n= 6=n >n [6=n] [6][=]n
> >2 ? >n overall stability
constants
L adalah ligan monodentat
n adalah B.K. atom logam M
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• Harga K dan > dari suatu %o!#l"%s saling"ruungan satu sa!a lain* 6isal%ansa$a #ada suatu %o!#l"%s 6=n arga>3n&a adala
• n K 1 2 K - 2 .) 2 K n
• #o! n #o! K 1 #o! K - ..)) #o! K n
Harga βn merupakan ukuran daristabilitas suatu senyawa kompleks.Makin besar harga βn , makin stabil
kompleks tersebut.
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5
Ksta"i#an Ion Kom$#&s
i#"ngarui ol" loga! #usat
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=oga! @"nis a dan @"nis
l"%tron"gati9itas danK"!a!#uan olarisasi =oga!
"ngaru CS
1%uran dan 6uatan =oga! usat
Pn!ar%h Lo!am P%sat
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1%uran dan 6uatan Ion usat
arga DEr &ang !a%in "sar !"dan listri% dari
loga! #usat s"!a%in "sar #ula*
=i+ (r ;F;G) Na+ (r ;4:G) K + (r 33 G) 0+ (r <G) Cs+ (r F4G)
Jari-jari ion logam
stabilitasnya /<+ (r ;4:G) J3+ (r ;43G) Ca2+ (r ;44G) Na+ (r
;4:G)Muatan ion stabilitasnya
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"ngaru CS• CS !"ning%at%an %"stailan %o!#l"%s so
K !a%s da#at dira!al%an a%an di#"rol" #ada%o!#l"%s d"ngan loga! #usat &ang !"!ili%i%ongurasi "l"%tron d3 dan dI %ar"na%ongurasi ini a%an !"!"ri%an arga CS&ang #aling "sar*
• urutan stailitas %o!#l"%s "rdasar%an%ongurasi "l"%tron #ada orital d !"ngi%utiurutan s"agai "ri%ut 8
• d; d d2 d3d< d: dF d5 dI d4
d;
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l"%tron"gati9itas dan K"!a!#uanolarisasi =oga!
• Ko!#l"%s &ang t"r"ntu% dari loga! d"ngan"l"%ton"gati9itas &ang tinggi a%an !"ngasil%an%o#!#l"%s &ang l"i stail
• ala! al &ang sa!a loga! d"ngan%"!a!#uan #olarisasi &ang l"i "sar $uga
a%an !"ngasil%an %o!#l"%s &ang l"i stail*
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=oga! $"nis a dan
1. Logam kelas a 8 loga!-loga! &ang l"i
"l"%tro#ositif (al%ali dan al%ali tana loga!transisi #"rta!a loga! #ada d"r"t =antanida danA%tinida) stail dg ligan unsur #"riod" 2 (NO)
2. Logam kelas b 8 loga!-loga! &ang l"i"l"%tron"gatif s"#"rti t Au Hg loga!-loga!transisi ringan d"ngan ilangan o%sidasi &angr"nda stail dg ligan #"riod" %"tiga (SCl)
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Pn!ar%h Li!an
Beberapa actor dari ligan yang mempengaruhikestabilan kompleks
6&%ran dan m%atan #i!an
Momn Di$o# dari Li!an
Si7at Basa Li!an
Kmam$%an mm"nt%& i&atan !
E7& Stri&
E7& Kh#at
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• %o!#l"%s &ang stail a%an t"r"ntu% dari ligan&ang "ru%uran %"7il dan !"!ili%i !uatan &ang"sar*
• !a%in "sar !o!"n di#ol dari suatu liganstailitas %o!#l"%s &ang t"r"ntu% !a%in "sara!ina "tila!in di"tila!in tri"tila!in
• !a%in asa suatu ligan %o!#l"%s &ang t"r"ntu%a%an s"!a%in stail 5 / #5/ Br5 / I5 / N93 / 9-O / 9
• ligan-ligan &ang da#at !"!"ntu% i%atan L d"nganloga! !"!"ntu% %o!#l"%s &ang l"i stail*6isaln&a sa$a ligan CN- CO 03 dan al%"na*
• Adan&a "f"% st"ri% da#at !"l"!a%an i%atanloga! d"ngan ligan*• =igan &ang !"ru#a%an suatu ligan #"ng%"lat
!"!"ntu% %o!#l"%s &ang l"i staildianding%an ligan u%an %"lat
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Pnnt%an Tta$an Sta"i#itas
A B K' :; ( :A;:B;
Kc = tetapanstabilitas
Harga K dapat dicari jika kons. mula – mula zat yang bereaksi dan zat pada
saat kesetimbangan diketahui.
Kesukaran penentuan harga K disebabkan :1. Akan terbentuk pula kompleks lain.
2. enentuan masing ! masing spesi sering mengganggu kesetimbangan
"#o$%H2&'(2) ) #l! "#o$%H2&*#l() ) H2%
+. ,etapan stabilitas sebenarnya bergantung kepada akti-itas bukan kepadakonsentrasi.
Ka / a# 0 aA . a / c # 0 cA. c
a / c .M
konsentrasiKo"f*a%ti9itas
sulit ditentukanɤ
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• Kons"ntrasi s#"si dala! lar* a#at dila%u%an d"ngan7ara
1) S$&tros&o$i
1ntu% !"n"ta#%an %ons"ntrasi s"n&a'a %o!#l"%s
"r'arna di!ana %"ta$a!an 'arna s"andingd"ngan %ons"ntrasi*H%*=a!"rt-B""r=og I E Io o*d * '* = od (o#ti7al d"nsit&)di%"taui dg s"#tofoto!"t"r
Conto 8"3+ + NCS- ["(NCS)]2+
K7 ["(NCS)]2+ E ["3+ ][NCS-]-) E#&tro#isa
1ntu% !"n"ntu%an %7 di!ana %"s"ti!angandi#"ngarui ol" #H* B"srn&a H+ dit"ntu%an ol" #H!"t"r*6isal #ada #"!"ntu%an %o!#l"%s [Ag(NH3)2]+
Ag+ + NH3 [Ag(NH3)]+ K
[Ag(NH3)]+
+ NH3 [Ag(NH3)2]+
K2
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• Stailitas suatu s"n&a'a "rgantung #ada"n"rgi r"a%sin&a s"dang%an lailitass"n&a'a "rgantung #ada "n"rgi a%ti9asi
dari s"n&a'a t"rs"ut• Harga βn merupakan ukuran dari stabilitas
suatu senyawa kompleks. akin besar!arga βn, makin stabil kompleks tersebut.
• Kestabilan kompleks dipengaru!i ole!atom pusat dan ligan
KESIMP6LAN
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