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A2 Chemistry Redox Titrations Question watch

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    Hi, I need some help with this question:

    3.00g of lawn sand containing an iron(II) salt was shaken with dilute H2SO4. The resulting solution required 25cm3 of 0.2moldm-3 potassium manganate(VII) to oxidise the Fe2+ ions in the solution to Fe3+ ions. Use this to calculate the percentage by mass of Fe2+ ions in this sample of of lawn sand.

    I've been able to find the number of mols in the iron salt solution, however I don't know what to do next seeing as there is no volume for me to work out the concentration.
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    (Original post by Umi-chan)
    Hi, I need some help with this question:

    3.00g of lawn sand containing an iron(II) salt was shaken with dilute H2SO4. The resulting solution required 25cm3 of 0.2moldm-3 potassium manganate(VII) to oxidise the Fe2+ ions in the solution to Fe3+ ions. Use this to calculate the percentage by mass of Fe2+ ions in this sample of of lawn sand.

    I've been able to find the number of mols in the iron salt solution, however I don't know what to do next seeing as there is no volume for me to work out the concentration.
    What is the mass of the Fe(II) ions present? You should be able to find the percentage from there.
 
 
 
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