1. What Na compound is insoluble? What nitrate is insoluble. You must have an insoluble material to use it gravimetrically.
2. You want to use Le Chatelier's Principle. An excess of the pptng solution will cause the ppt to be less soluble and that leads to more complete pptn.
3. P in plants can get there by being soluble so the plant roots can take it into the system. Soluble P can be determined in fertilizer by pptg it as MgNH4PO4, filter, then fire in an furnace to convert to MgP2O7 (magnesium pyrophosphate), cool and weigh.
1. Why can’t gravimetric analysis be used to determine the concentration of sodium nitrate (NaNO) in a solution?
2. Why is it important in gravimetric analysis to add an excess amount of precipitating ions to a solution containing an analyte?
3. Relate gravimetric analysis to the phosphorus content in plant food. Include the form in which phosphorus exists in plant food and the ion you could used to precipitate the phosphorus.
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mommy
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