Why Use a High Phenanthroline to Iron Mole Ratio in Iron Concentration Analysis?

In summary, the lab in question involved determining the iron concentration in a tablet using a colored complex, [Fe(phen)3]2+, with a mole ratio of 3:1 for phen:Fe. However, the absorbing solution used had a mole ratio of 52.8:1 for phen:Fe, with a corrected ratio of 5.2:1. The reason for using such a high excess of 0-phenanthroline in the absorbing solution was to accurately determine the unknown concentration of iron in the tablet.
  • #1
corinnab
9
1
1. This is a question about a lab.
The absorbing solution used in the lab had a mole ratio of phen to Fe of 52.8:1
However, the complex [Fe(phen)3]2+ has a mole ratio of 3:1 for phen:Fe

[Fe(phen)3]2+ is a coloured complex and we were determing iron concentration in a tablet.

I don't understand why we used a solution with such a high mole ratio, would appreciate any help!
 
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  • #2
EDIT: the ratio in the absorbing solution is 5.2:1 I made a mistake
So what i would like to know is why the excess 0-phenanthroline in the absorbing solution?
 
Last edited:
  • #3
You were determining the unknown concentration of iron in the tablet and used an excess of the reagent to determine iron.
 

FAQ: Why Use a High Phenanthroline to Iron Mole Ratio in Iron Concentration Analysis?

What is the Iron 0-phenanthroline complex?

The Iron 0-phenanthroline complex is a coordination compound that contains an iron atom bonded to several 0-phenanthroline ligands. It is commonly used in chemical and biological research as a catalyst for various reactions.

How is the Iron 0-phenanthroline complex synthesized?

The Iron 0-phenanthroline complex can be synthesized by reacting iron(II) chloride with 0-phenanthroline in the presence of a reducing agent such as sodium borohydride. The resulting product is a dark green crystalline solid.

What are the properties of the Iron 0-phenanthroline complex?

The Iron 0-phenanthroline complex is highly stable and soluble in polar solvents. It has a melting point of around 250°C and is a strong reducing agent. It also exhibits intense absorption bands in the visible region, making it useful for colorimetric assays.

What are the applications of the Iron 0-phenanthroline complex?

The Iron 0-phenanthroline complex has a wide range of applications in chemistry and biology. It is commonly used as a catalyst in organic reactions, as well as a reagent in analytical chemistry for the determination of various substances. It is also used in medical research for its potential anti-tumor properties.

Is the Iron 0-phenanthroline complex toxic?

The Iron 0-phenanthroline complex is considered to be relatively non-toxic. However, it is important to handle it with caution and follow proper safety protocols, as with any other chemical compound. Ingestion or inhalation should be avoided, and skin contact should be minimized to prevent any potential irritation.

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