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1. wiegh approximately 15g of spinach

2. using scissors, cut the leaves into small pieces and place in a 250cm3 beacker ( if frozen simply place in beacker)

3. using a measuring cylinder, add 50cm3 1.0 moldm-3 sulphuric acid ( CARE irritant) and boil the mixutre gently for 5 mins

4. allow mixture to cool then filter it, using a buchner funnel and vacuum filtration . wash the residue in the funnel one with a little distilled water to collect all the filtrate

5. pour all the filtrate and washing s into a 100cm3 volumetric flask. make up to 100cm3 with 1.0moldm-3 sulphuric acid. stopper the flask and shake it well.

6. fill the burette with potassium manganate (VII) solution (CARE stains cloths)

7. using a pippette transfer 10cm3 of the spinach extract solution to the 250cm3 conical flask and add 50cm3 of 1.0 moldm03 potassium manganate (VII) solution from the burrette until pink colour persists for 30 seconds.

lol i hope that helps lol

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13y ago
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AnswerBot

5mo ago

To extract iron from spinach, the leaves need to be boiled in acid to release the iron ions. The solution is then filtered to remove solid particles and the iron content is determined via titration with a known concentration of a chelating agent like EDTA. The endpoint of the titration is reached when the chelating agent binds to all the iron ions, forming a colored complex.

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Q: What are the procedures for extracting iron from spinach titration?
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Why is it necessary to acidify iron with h2so4 during redox titration?

Acidifying iron with H2SO4 during redox titration helps in preventing the hydrolysis of iron(III) ions, which can form insoluble hydroxides and interfere with the titration results. The acid medium also helps to ensure that the redox reaction between the iron and the titrant is carried out effectively and selectively.


Why acid is added to iron ammonium solution before titration?

Acid is added to the iron ammonium solution to lower the pH and prevent the hydrolysis of iron ions, which can affect the accuracy of the titration results. Acid also helps dissolve any precipitates that may form during the titration process, ensuring a clear and accurate endpoint.


Why do we heat KSCN Fe solution befor titration with EDTA?

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What is the function of NH4CNS in titration?

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