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Chemistry Forums for Students => Analytical Chemistry Forum => Topic started by: filip jovic on November 28, 2020, 07:58:22 AM

Title: gravimetric determinetion of iron(III)
Post by: filip jovic on November 28, 2020, 07:58:22 AM

hello,
for my thesis i have to determen the iron percentage in a sample using gravimetry. i know this is a homogeneous precipitation, but i dony know the theory behind this, can someone explain this to me and how to do it in the lab.

Title: Re: gravimetric determinetion of iron(III)
Post by: chenbeier on November 28, 2020, 09:18:38 AM

1. You get weight of your sample.
2. Dissolve it in water, acid, etc.
3. Do a chemical reaction by adding something that the iron precipitate
4.Filter it and dry it
5. Get weight of it, calculate to Fe
6. Quotient of this weight to sample weight times 100 gives percentage

Title: Re: gravimetric determinetion of iron(III)
Post by: filip jovic on November 29, 2020, 04:14:51 AM

thank you for the instructions. but can you explain the theory behind it, i have to give the theory aswell but i dont re&ally understand it that well

Title: Re: gravimetric determinetion of iron(III)
Post by: AWK on November 29, 2020, 05:08:56 AM

Search textbooks, handbooks, and original literature. Maybe even the internet will help.

Title: Theory precipitation iron
Post by: filip jovic on November 29, 2020, 06:39:48 AM

Hello,
I have to determine the iron3+ in a monster. The procedure is: i have to take 0,800 gram of my monster, add 50 ml water and 2 ml HCl then i have to heat it till boiling point then add 1 ml HNO3. And lengthen it to 200 ml. Then i have to add 20 ml NH3 very slowly. Etc..

My question is what is the theory behind this particular precipitation. Can someone explain this to me. It is for my thesis

Title: Re: Theory precipitation iron
Post by: mjc123 on November 29, 2020, 07:02:15 AM

What's your monster? King Kong? Godzilla? We need to know in order to explain the theory.

Seriously though, if you're writing a thesis, a elementary part of the work for your thesis is to learn the theory behind what you're doing. We're not here to do your work for you. Anyway, how much theory is there behind a precipitation? You make something insoluble, it precipitates.

Title: theory of Gravimetric analysis
Post by: filip jovic on November 29, 2020, 07:32:53 AM

can someone explain fully the theory of Gravimetric analysis.

Title: Re: theory of Gravimetric analysis
Post by: billnotgatez on November 29, 2020, 10:19:17 AM

This is a question that is complex
Try this WIKI
Gravimetric analysis
https://en.wikipedia.org/wiki/Gravimetric_analysis (https://en.wikipedia.org/wiki/Gravimetric_analysis)

Come back with what parts you do not understand and your thoughts

Title: Re: gravimetric determinetion of iron(III)
Post by: billnotgatez on November 29, 2020, 10:28:17 AM

I have merged all your threads on this topic since they are all similar.

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