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Topic: oxidation reduction titration questions  (Read 6788 times)

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Offline ellie-jelly

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oxidation reduction titration questions
« on: May 05, 2008, 04:09:12 AM »
hi there. this is my first time on this board, hopefully I've put this into the right forum.

okay, so i am confused with this question

"the NH4+ and SO42- ions from the ammonium iron (II) sulfate are spectator ions in the redox reaction between the ammonium iron (II) sulfate and the potassium permanganate in sulfuric acid. Write the net ionic half equation for the oxidation of the Fe2+ ions to Fe3+ ions"

would i just write Fe2+ --> Fe3+ ?

i unfortunately get easily confused with the way my lecturers have written out our lab manuals :(

also for the question

"the K+ ion from KMnO4 and the SO4 2- ion from H2SO4 are spectator ions in this redox reaction. Write the net ionic half equation for the reduction of the MnO4- ions to Mn2+ ions in sulfuric acid"

i'm not really sure what to do with this question. are there any websites people could recommend that would give me a step by step explanation.

if i have made this question more confusing then it should, i do apologise

Offline Borek

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Re: oxidation reduction titration questions
« Reply #1 on: May 05, 2008, 06:16:42 AM »
would i just write Fe2+ --> Fe3+ ?

Use electrons to balance charge - at the moment only atoms are balanced.

Quote
"the K+ ion from KMnO4 and the SO4 2- ion from H2SO4 are spectator ions in this redox reaction. Write the net ionic half equation for the reduction of the MnO4- ions to Mn2+ ions in sulfuric acid"

i'm not really sure what to do with this question. are there any websites people could recommend that would give me a step by step explanation.

http://www.chembuddy.com/?left=balancing-stoichiometry&right=half-reactions-method
Chembuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info

Offline ellie-jelly

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Re: oxidation reduction titration questions
« Reply #2 on: May 05, 2008, 06:40:36 AM »
so the result would be Fe2+ ---> Fe 3+ + e ?

thank you for the great link :)


Offline Borek

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Re: oxidation reduction titration questions
« Reply #3 on: May 05, 2008, 07:02:26 AM »
OK, OK ;)
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