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Topic: Questions about cr(acac)3 exp.  (Read 16620 times)

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Offline lovelyangle

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Questions about cr(acac)3 exp.
« on: September 25, 2007, 04:55:08 PM »
hi

we synthesis cr(acac)3 and i want your help to answer some questions about it >>

1 - why is NaOH not used (instead of urea) to make the solution basic ?

2- how does urea make the solution basic ?

3- why was a steam bath used to heat the reaction flask instead of a direct flame ?

please help me

>>

Offline AWK

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Re: Questions about cr(acac)3 exp.
« Reply #1 on: September 26, 2007, 01:33:49 AM »
AWK

Offline lovelyangle

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Re: Questions about cr(acac)3 exp.
« Reply #2 on: September 26, 2007, 01:48:36 PM »
thx

how i can improve the percentage yeild ??

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Offline AWK

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Re: Questions about cr(acac)3 exp.
« Reply #3 on: September 27, 2007, 12:53:21 AM »
Usuallay an excess of acac is used
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Offline mahesh

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Re: Questions about cr(acac)3 exp.
« Reply #4 on: October 19, 2007, 09:50:15 AM »
acac is acetylacetonate. The complex would hydrolyse if you use NaOH, hence urea is used. Read why -NH2 group has basicity.
acac complexes usually give high yields. I have prepared acac complexes of many metals, and had no issues of yield. You always use slight excess of the ligands while making organometallic complexes.

Offline hala

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Re: Questions about cr(acac)3 exp.
« Reply #5 on: October 24, 2007, 01:34:01 PM »
hi

we synthesis cr(acac)3 and i want your help to answer some questions about it >>

1 - why is NaOH not used (instead of urea) to make the solution basic ?

2- how does urea make the solution basic ?

3- why was a steam bath used to heat the reaction flask instead of a direct flame ?

please help me

>>


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