Help with calculating amount of Fe
I did an experiment involving the gravimetric determination of Iron in Geritol.
At the end of the experiment I was left with a product, Fe2O3 that weighed 0.417 g
I'm not sure how to calculate the amount of Iron from here.
This is what I did.
I calculated the molar mass of Fe2O3 to be 159.6922 g.
Then I figured that Fe2O3 was 69.9433% Fe.
So I multiplied the weight of my product with the % to get 0.28096 g of Fe in my product.
Does this make any sense?
The manufacturer's analysis of Geritol says there should be 60 mg of elemental Iron per tablet.
(my sample contained two tablets)
Are my calculations wrong? Or did I mess up the experiment??
Please help ASAP!
THANKS!
Re: Help with calculating amount of Fe
I checked your calculations and they seem to be correct.
If you got your Fe2O3 by precipitation, perhaps you need to add more of the substance used to precipitate out the Fe203 just so that u get all the Fe out of the solution. Also when you write out the equation of the reaction, did you balance it? Maybe you didn't take into consideration the number of moles of Fe2O3 you got in the end.