Chemical Forums
Chemistry Forums for Students => High School Chemistry Forum => Topic started by: ChuckleBuckle on April 21, 2015, 09:00:57 PM
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For my school practical, we were told to prepare a standard iron (ii) ammonium sulphate solution and then titrate it when potassium permanganate.
The procedure goes like this:
-Weigh 4g of hydrated iron (ii) ammonium sulphate.
-Dissolve it in water and place into a volumetric flask
-Add 5mL of 12M sulphuric acid
-Shake the mixture and add distilled water until the calibration mark
-Pipette 25mL of the iron (ii) ammonium sulphate solution into a conical flask.
-Add 10mL of 2M sulphuric acid into the concical flask -Titrate with potassium permanganate
What i want to know is why do you add two different concentrations of sulphuric acid and do they both have different purposes?
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The first one is there just to stabilize the solution (prevent precipitation of iron hydroxides), the second one is a necessary reagent for the permanganate reaction (try to write balanced reaction equation).
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The first one is there just to stabilize the solution (prevent precipitation of iron hydroxides), the second one is a necessary reagent for the permanganate reaction (try to write balanced reaction equation).
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