Page Tools save to page cancel 1. Plant Food Label: Fertilizer B NPK ratio: 15-3

Question

Page Tools save to page cancel 1. Plant Food Label: Fertilizer B NPK ratio: 15-30-15 (from fertilizer label) Your data Group1 Group 2 Group 3 2. Average Mass of MgNH4PO4 6H20 3. Avg. Mass of P in Original sample: 4. Average % P: 5. Actual % P ( calc, from NPK ratio): 6. % error: 2.21 3.84 4.57 0.2789 0.484 0.58 14 24.25 28.75 15-30-15 6.67 19.20 4.17 7. Average % P205 ( calc. from Avg. %P) 30 8. Reported % P2O5 (from NPK ratio) ( Do not need to calculate % error for P205) Currently editing a 02018 LabArchives, LLC. All rights reserved.

Explanation / Answer

The standard Relation between P2O5 and P (U.S. System and Metric Units)

P x 2.29 = P2O5

% P2O5 = % P x 2.29

For group 1

% P2O5 = 14 x 2.29 = 32.06%

For group 2

% P2O5 = 24.25 x 2.29 = 55.5325%

For group 3

% P2O5 = 28.75 x 2.29 = 65.8375%

Reported % P2O5 = 30 x 2.29 = 68.7 %

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