Home >
Community >
Determination of stability constant of Fe(III)-Salicylic acid complex?
Upvote
VOTE
Downvote
+ Physical chemistry
Posted by
Kaori Kitao
Determination of stability constant of Fe(III)-Salicylic acid complex?
You can't get it from bad data. In any case, I think you need a value for the extinction coefficient of the complex in order to calculate the concentration. Quote
Where did you get those numbers, and what formula are you using for stability constant? How did you get the stoichiometry 3? It looks difficult to get any number with confidence out of this curve. But see e.g. https://www.odinity.com/determination-salicylate-via-reaction-feiii/
You can't get it from bad data. In any case, I think you need a value for the extinction coefficient of the complex in order to calculate the concentration. Quote
Where did you get those numbers, and what formula are you using for stability constant? How did you get the stoichiometry 3? It looks difficult to get any number with confidence out of this curve. But see e.g. https://www.odinity.com/determination-salicylate-via-reaction-feiii/
I already did the experiment and those are the values I got. I plot the job's plot and got correctly stoichiometric ratio as 3 now i have to find the Stability constant? How do I find it?
I already did the experiment and those are the values I got. I plot the job's plot and got correctly stoichiometric ratio as 3 now i have to find the Stability constant? How do I find it?
This doesn't look like a good Job plot. It's too flat across the middle. I suspect your absorbance is saturating. It is usually recommended to stay within the range A ≤ 0.1 to get good Beer-Lambert linearity of response. Can you repeat the experiment with lower concentrations (or shorter path length, e.g. if you are using a 1 cm cell, try a 1 mm cell)?
This doesn't look like a good Job plot. It's too flat across the middle. I suspect your absorbance is saturating. It is usually recommended to stay within the range A ≤ 0.1 to get good Beer-Lambert linearity of response. Can you repeat the experiment with lower concentrations (or shorter path length, e.g. if you are using a 1 cm cell, try a 1 mm cell)?
QuoteWhere did you get those numbers, and what formula are you using for stability constant?
How did you get the stoichiometry 3? It looks difficult to get any number with confidence out of this curve. But see e.g. https://www.odinity.com/determination-salicylate-via-reaction-feiii/
QuoteWhere did you get those numbers, and what formula are you using for stability constant?
How did you get the stoichiometry 3? It looks difficult to get any number with confidence out of this curve. But see e.g. https://www.odinity.com/determination-salicylate-via-reaction-feiii/
More
VOTE
I plot the job's plot and got correctly stoichiometric ratio as 3 now i have to find the Stability constant? How do I find it?
I plot the job's plot and got correctly stoichiometric ratio as 3 now i have to find the Stability constant? How do I find it?
More
VOTE
More
VOTE