CariDotMy

 Forgot password?
 Register

ADVERTISEMENT

1234Next
Return to list New
View: 11096|Reply: 71

persamaan kimia..nk mintak tolong (dah ade gambar....tapi yang nano takleh save)

[Copy link]
Post time 15-8-2008 10:31 AM | Show all posts |Read mode
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 ]
Reply

Use magic Report


ADVERTISEMENT


Post time 15-8-2008 10:50 AM | Show all posts
magnesium ethoxide + ethanol = kebabom
Reply

Use magic Report

 Author| Post time 15-8-2008 11:02 AM | Show all posts
ok gak ek..kebabom...kat umah ko:@ :@ :@
Originally posted by akinari at 15-8-2008 10:50 AM
magnesium ethoxide + ethanol = kebabom
Reply

Use magic Report

Post time 15-8-2008 04:44 PM | Show all posts
haha...dh lame tingglkan kimia ni...Mg(OC2H5)2 ni bes ker??...

[ Last edited by  jebeng at 15-8-2008 04:46 PM ]
Reply

Use magic Report

 Author| Post time 15-8-2008 06:06 PM | Show all posts
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??...
Reply

Use magic Report

Post time 15-8-2008 08:29 PM | Show all posts
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
Reply

Use magic Report

Follow Us
Post time 17-8-2008 02:14 PM | Show all posts
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...
Reply

Use magic Report

Post time 17-8-2008 07:22 PM | Show all posts
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
Reply

Use magic Report


ADVERTISEMENT


Post time 17-8-2008 10:11 PM | Show all posts
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?
Reply

Use magic Report

 Author| Post time 18-8-2008 08:14 AM | Show all posts
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?
Reply

Use magic Report

 Author| Post time 18-8-2008 08:15 AM | Show all posts
etanoat n etoxide tu lain ke..sy tatau laaaa
Originally posted by jebeng at 17-8-2008 07:22 PM


actually tu..

Magnesium ethanoat + etanol
Reply

Use magic Report

 Author| Post time 18-8-2008 08:15 AM | Show all posts
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...
Reply

Use magic Report

 Author| Post time 18-8-2008 08:17 AM | Show all posts
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... ...
Reply

Use magic Report

Post time 18-8-2008 01:03 PM | Show all posts
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
Reply

Use magic Report

 Author| Post time 18-8-2008 03:12 PM | Show all posts
ooo....tq2....tapi kan...yang sy punye ni..hasilnye nnti saya nak MgO..so..yang Mg-OH tu die cam lebey kurang MgO ke...tapi apa2 pon...tq very much..truly appreciate it......da seminggu tangguh sbb nk carik pesmaan ni....
Originally posted by awan at 18-8-2008 01:03 PM



ni jawp anak sy...

   Mg(OC2H5)2 + C2H6O
   Mg-O-CH2-CH3 + CH3-CH2-0-H
   Mg-OH + CH3-CH2-O-CH2-CH3
Reply

Use magic Report

Post time 18-8-2008 04:08 PM | Show all posts

Reply #15 emiliahani's post

sama kot...

MgOH + CH3-CH2-O-CH2-CH3
Reply

Use magic Report


ADVERTISEMENT


 Author| Post time 18-8-2008 04:41 PM | Show all posts
oooo ok2...so luse da leh try buat dah...maksudnye nnti ratio die 1 jek...ok..time kasih bebanyak ek...nnti klo da jadi sy updatekan result die
Reply

Use magic Report

Post time 18-8-2008 04:47 PM | Show all posts
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....
Reply

Use magic Report

Post time 18-8-2008 07:11 PM | Show all posts
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 ]
Reply

Use magic Report

Post time 19-8-2008 07:47 AM | Show all posts
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 ]
Reply

Use magic Report

You have to log in before you can reply Login | Register

Points Rules

 

ADVERTISEMENT



 

ADVERTISEMENT


 


ADVERTISEMENT
Follow Us

ADVERTISEMENT


Mobile|Archiver|Mobile*default|About Us|CariDotMy

27-11-2024 09:03 PM GMT+8 , Processed in 0.083457 second(s), 33 queries , Gzip On, Redis On.

Powered by Discuz! X3.4

Copyright © 2001-2021, Tencent Cloud.

Quick Reply To Top Return to the list