Help!! chemistry titration coursework

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sarsh
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#1
Report Thread starter 15 years ago
#1
can anyone help?
does anyone have chemistry coursework to do for A2 a titration to find out how much iron (ii) and iron (iii) there is in a solution. im supposed 2 research on it but i can find any thing on the internet. does any one know any good sites?? please help!!
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winged_hippo
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can't help you with any good sites, but look for stuff about complex ions and EDTA.
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winged_hippo
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complexometric (complexiometric -depending on source) titrations are the way forward lol

potassium manganate (vii) titration can determine iron (ii) content:

MnO4- + 8H+ + 5Fe2+ --> Mn2+ +4H2O + 5Fe3+

and complexometric titration with EDTA can determine iron (iii) content:

Fe3+ + H4Y --> FeY- + 4H+

(where Y is EDTA4- ion)


(i did this coursework...used books for reference)
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sarsh
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thanks that should help alot
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Fluent in Lies
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What would be a suitable indicator?And what would be in your buffer solution?

Thanks for the help.
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Fluent in Lies
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and whay all this convoluted back titration anyway? Why are you unbale just to say titrate the cl2 directly ?
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charco
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What is the original solution made of? Is it a mixture of two iron salts only? Do you have the total mass of the solute? What other information are you given?
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Fluent in Lies
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It is a back titration experiment ( i assume mine and sarsh's is the same cwrk).

Have to find the conc of aqueous chlorine solution.

React solution with reducing agent (Fe(II)) then determine the amount of reducing agent left over by titration.

So is it a titration of fe(III) from

Cl2 + Fe2+ -> 2Cl- + Fe3+

or a titration of fe(II) that would be left over?
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charco
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If you are determining chlorine solution I would do it with XS KI solution and titrate the liberated iodine using standard sodium thiosulphate with starch indicator
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