At each point in the procedure, you are striving to maximize the amount of phosp

Question

At each point in the procedure, you are striving to maximize the amount of phosphorus recovered from the fertilizer. Which of the procedural steps below will NOT improve your recovery of phosphorus? Allow the mixture of MgSO_4 solution and fertilizer filtrate to stand in an ice bath for 30 minutes. Add 50% more of the calculated amount of MgSO_4 solution to the water-soluble components of the fertilizer. Test the pH of the mixture of MgSO_4 solution and fertilizer filtrate and, if necessary, add ammonia until the pH is at least 9. Rinse the precipitate with deionized water and set it to dry. Indicate whether each of the following experimental difficulties will lead to an artificially high or an artificially low value in the mass of phosphorus recovered. The MgSO_4 solution causes additional water soluble components in the fertilizer to precipitate out of solution. Fertilizer companies often over formulate their fertilizers so that the nutrient content a higher than what is promised on the label. The pH of the mixture of MgSO_4 solution and fertilizer filtrate is less than 9. The precipitate is not completely dry before it is weighed out. Your group's procedure does not completely separate the water soluble from the water insoluble components of the fertilizer. Low Does not affect the mass of phosphorus recovered. High

Explanation / Answer

Answer 5:

Test the pH of the mixture and fertilizer filtrate and add ammonia until the pH is at least 9. This step is not responsible for improving the recovery of nutrient.

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