View: 11086|Reply: 71
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persamaan kimia..nk mintak tolong (dah ade gambar....tapi yang nano takleh save)
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tak pandai sangatla kimia..nk mintak tolong ..seimbangkan persamaan nih
Mg(OC2H5)2 + C2H6O...
tataula hasilnye ape...
thanks ek.
camne nk characterize ek klo die cecaik..
yang me punye..yang cecair tu letak atas ito substrat..
pastu mse buat SEM die cam bergumpal...so..nk wt camne ek
[ Last edited by emiliahani at 26-9-2008 04:33 PM ] |
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magnesium ethoxide + ethanol = kebabom |
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haha...dh lame tingglkan kimia ni...Mg(OC2H5)2 ni bes ker??...
[ Last edited by jebeng at 15-8-2008 04:46 PM ] |
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tataula bes ke tak lom leh try lagik...kene kire jisim nak pakai bape
first nak seimbangkan dulu...tau tak????Originally posted by jebeng at 15-8-2008 04:44 PM
haha...dh lame tingglkan kimia ni...Mg(OC2H5)2 ni bes ker??... |
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yup kene seimbangkan dulu br leh dpt brape mol....
tu la konpius....biase asid karbosilik + etanol = ester + air .....dlm proses pengesteran....boleh wat minyak wangi....tp ade magnesium tu...huhu...agak konpius...
dpt formula ni dr mane??...kureng pakar la...kene stdy skit la |
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Originally posted by emiliahani at 15-8-2008 10:31
tak pandai sangatla kimia..nk mintak tolong ..seimbangkan persamaan nih
Mg(OC2H5)2 + C2H6O...
tataula hasilnye ape...
thanks ek...
Mg(OCH2CH3)2 + CH3CH2OH
ester + alkohol ---> ??
sry tak dpt tolong... |
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Originally posted by Atomic_Omnikid at 17-8-2008 02:14 PM
Mg(OCH2CH3)2 + CH3CH2OH
ester + alkohol ---> ??
sry tak dpt tolong...
actually tu..
Magnesium ethanoat + etanol |
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Originally posted by jebeng at 17-8-2008 19:22
actually tu..
Magnesium ethanoat + etanol
oh yea..lupa plak
CH3CH2-O-Mg-O-CH3CH2
R-O-Mg-O-R'
ester: RCOOR'
mana tuan rumah dpt soalan nie? |
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ni bukan soalan..org kene fabricate MgO..so nak kene timbang jisim...pls klo tau...tak tau kimia...takat matrik jek....Originally posted by Atomic_Omnikid at 17-8-2008 10:11 PM
oh yea..lupa plak
CH3CH2-O-Mg-O-CH3CH2
R-O-Mg-O-R'
ester: RCOOR'
mana tuan rumah dpt soalan nie? |
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etanoat n etoxide tu lain ke..sy tatau laaaaOriginally posted by jebeng at 17-8-2008 07:22 PM
actually tu..
Magnesium ethanoat + etanol |
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ok2 takpa...thanks ek..Originally posted by Atomic_Omnikid at 17-8-2008 02:14 PM
Mg(OCH2CH3)2 + CH3CH2OH
ester + alkohol ---> ??
sry tak dpt tolong... |
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sy nak kene fabricate nano-MgO sendirik...sebelum ni org buat TiO2....MgO lom tau ade org penah wt ke tak...ala...dala tak pandai kimia...member pon tatau.....Originally posted by jebeng at 15-8-2008 08:29 PM
yup kene seimbangkan dulu br leh dpt brape mol....
tu la konpius....biase asid karbosilik + etanol = ester + air .....dlm proses pengesteran....boleh wat minyak wangi....tp ade magnesium tu... ... |
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Originally posted by emiliahani at 15-8-2008 10:31 AM
tak pandai sangatla kimia..nk mintak tolong ..seimbangkan persamaan nih
Mg(OC2H5)2 + C2H6O...
tataula hasilnye ape...
thanks ek...
ni jawp anak sy...
Mg(OC2H5)2 + C2H6O
Mg-O-CH2-CH3 + CH3-CH2-0-H
Mg-OH + CH3-CH2-O-CH2-CH3 |
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Reply #15 emiliahani's post
sama kot...
MgOH + CH3-CH2-O-CH2-CH3 |
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Originally posted by awan at 18-8-2008 04:08 PM
sama kot...
MgOH + CH3-CH2-O-CH2-CH3
erm....kalo x silap...Mg cas die +2....sbb tu ethanoat =Mg(OC2H5)2..OH cas -1....kalo product die btul cam tu = Mg(OH)2 la.....pe kata post la persamaan kimia TiO2 yg org dh buat tu....basicnye same je just klas unsur yg berbeza.....Ti unsur 4...Mg klas unsur 2/logam alkali....
MgO x same ngn MgOH....huhu since sifat die...MgO substance warna hijau...MgOH cecair bes.... |
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Originally posted by emiliahani at 15-8-2008 10:31 AM
tak pandai sangatla kimia..nk mintak tolong ..seimbangkan persamaan nih
Mg(OC2H5)2 + C2H6O...
tataula hasilnye ape...
thanks ek...
Lama dah tak revise chemical equation.....
Kalau tak salah....
Mg(OC2H5)2 = Mg(OCH2CH3)2 = Magnesium Dietoxide atau ringkas Mg(OEt)2
contoh alkoxide yg lain: Sodium Ethoxide NaOCH2CH3
Alkoxide tak sama dengan ester (ester dari ethanol = ethanoate). Alkoxide dari ethanol = ethoxide.
Alkoxide biasanya dihasilkan bersama metal, e.g. K, Na, Mg, Al, etc...
Manakala ester: functional group -COO-, sebab ada satu double bond -C=O- dan satu single bond -C-O-
Persoalan:
Mg(OEt)2 (Magnesium Diethoxide) + C2H6O (Ethanol) = ???
Kalau Na + Ethanol (Achohol) = Sodium Ethoxide + Hydrogen
++++++++
Sikit intro...
Mungkin salah satu preparation Mg(OCH2CH3)2 adalah dari:
Mg + 2(CH3CH2OH) = Mg(OCH2CH3)2 + H2
(ethanol) Mg(OEt)2
setelah Mg diaktifkan terlebih dahulu supaya tindak-balas berlaku (mesti melepasi activation energy)
Dan ethanol tu mesti in excess supaya nak dapatkan sebanyak yg mungkin Mg(OCH2CH3)2. Jadi pada pendapat saya, tiada apa yang berlaku bila Mg(OC2H5)2 + C2H6O, cuma ia seumpama reaction di atas dalam berlebihan ethanol.
Boleh jadi juga alcohol (ethanol) digunakan sebagai solvent (pelarut) kepada Mg(OEt)2, dalam transition reaction......
Kalau nak dptkan MgO rasanya boleh secara pemanasan Mg(OCH2CH3)2 (decomposition), atau cara lain yang sesuai, melalui tindakbalas tertentu.
******************************************
Another possibility kalau berlakunya reversible reaction:
Mg(OEt)2 + 2EtOH = Mg(OH)2 + 2 Et-O-Et
Magnesium Diethoxide Ethanol Magnesium Hydroxide Diethyl Ether
Pemanasan (dehydation):
Mg(OH)2 (aq) --> MgO(s) + H2O (g)
Total equation: (under heating condition assuming decomposition occur)
Mg(OEt)2 (aq) + 2EtOH (aq) = MgO(s) + H2O (g) + 2 Et-O-Et(g)
Magnesium Diethoxide Ethanol Magnesium Oxide water Eiethyl Ether
where
Et = CH2CH3 (alkyl group, ethyl)
Cuma kemungkinan.... kalau betul....
Jadi 1 mol Mg(OEt)2 bertindak balas dengan 2 mol Ethanol menghasilkan 1 mol MgO
[ Last edited by mnm77 at 19-8-2008 07:01 AM ] |
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Susah gak bdak amik nano ni...huhu
Sori silap psl Mg(OC2H5)2 = ethanoat...huhu...
Preparation utk TiO2...
Ti{OCH(CH3)2}4 + 2 H2O → TiO2 + 4 (CH3)2CHOH
process ini dilakukan menggunakan sol-gel sintesis TiO2 based material....air dicampur bersama bahan Ti{OCH(CH3)2}4 didalam alkohol....Titanium isopropoxide is a component of the Sharpless epoxidation, a method for the synthesis of chiral epoxides. The compound is also used as a catalyst for the preparation of certain cyclopropanes in the Kulinkovich reaction. Prochiral thioethers are oxidized enantioselectively using catalyst derived from Ti(O-i-Pr)4 (dh x leh nk translate..berbelit)
Kalo pki Mg...(sbb Ti = +4..Mg=+2...bhg 2 je kot)
Mg{OCH(CH3)2}2 + H2O → MgO + 2 (CH3)2CHOH
130g 28g
p/s:tuan umah x btau pon ade process sol-gel ni.....dh la kimia tahap spm je...huhu
[ Last edited by jebeng at 19-8-2008 08:03 AM ] |
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Category: Belia & Informasi
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