Chemical Forums

Chemistry Forums for Students => Inorganic Chemistry Forum => Topic started by: tenki on June 15, 2020, 04:18:56 PM

Title: Determining the Oxidation state of Manganese(III) acetylacetonate
Post by: tenki on June 15, 2020, 04:18:56 PM

Hello Guys,
im about to synthesize Manganese(III) acetylacetonate and afterwards i have to determine the oxidation state by performing a redox titration. To do this i take 200mg of my synthesized product and add 1.00 g KI, 50 mL Water, 5 mL half diluted HCl and a little bit of NaHCO₂. I let it sit for while and mix it up a little from time to time. The seperated Iodine will be titrated with a Na₂S₂O₃-solution. The oxidation state has to be determinated by the used Na₂S₂O₃-solution, but im not quite sure how to do it, because i have problems with the Reaction equation.
I´m happy with every help i get :)

Title: Re: Determining the Oxidation state of Manganese(III) acetylacetonate
Post by: Borek on June 16, 2020, 02:54:43 AM

S₂O₃^2- is oxidized by iodine to S₄O₆^2-.

Title: Re: Determining the Oxidation state of Manganese(III) acetylacetonate
Post by: tenki on June 16, 2020, 10:52:01 AM

But how does the iodine get seperated by the manganese-complex? Understandig that reaction equation is crucial find out the oxidation state by titration.

Title: Re: Determining the Oxidation state of Manganese(III) acetylacetonate
Post by: AWK on June 16, 2020, 10:57:45 AM

Iodine can be extracted by various solvents.

Title: Re: Determining the Oxidation state of Manganese(III) acetylacetonate
Post by: tenki on June 16, 2020, 11:00:55 AM

But i dont quite understand where the correlation with the Manganes(III)acetylacetonate and its oxidation state comes from.

Title: Re: Determining the Oxidation state of Manganese(III) acetylacetonate
Post by: AWK on June 16, 2020, 01:47:13 PM

You did the synthesis according to some procedure. A good procedure not only gives a method of synthesis, but also a method of checking whether the correct compound has actually been obtained, or in the text of the procedure itself, or in the references.