Homework Help: chemistry

Posted by Mary on Friday, March 26, 2010 at 3:05am.

Hi
Can sombody please help me with this problem
If a soil sample contains 0.5g of iron (Fe3+) per 100g. The iron is precipitated when soil becomes alkaline as shown by equation Fe3+ + 3OH + (x-1)H2O ? FeOOH.xH2O(s)
The soil is sprayed with 50 wt% urea solution with density of 1.21g/ml
equation follows (H2N)2CO + H2O ? CO2+ 2NH4+ + 20H-

1) How do you express the concentration of Fe3+ in the soil sample in mmol/g?
2) How do you calculate the mass and the volume of urea solution needed to precipitate all Fe3+ in the soil sample?

Thanks

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