[lovelyangle]

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

>>

[AWK]

1. NaOH decomposes complex
2. http://www.colby.edu/chemistry/Grants/CH141L4Crfall2002.pdf
3. Safety

[lovelyangle]

thx

how i can improve the percentage yeild ??

>>

[AWK]

Usuallay an excess of acac is used

[mahesh]

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.

[hala]

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

>>