Calculation Results Gravimetric Method Results Summary Fertilizer Analysis Data for Gravimetric Method Trial 1 2 3 4 5 6 Mass of Sample g 916 910 910 913 911 910 Mass of Mg NH4 PO4 6H2O g Mass of P in Mg NH4 PO4 6H2O g Expected P2O5 in sample P2O5 in sample 7 8 910 912 690 661 636 671 642 630 658 668 087 083 080 085 081 079 083 084 24 24 24 24 24 24 24 24 21 78 20 99 20 20 21 24 20 37 20 01 20 90 21 17 Calculations Gravimetric Fertilizer Trial 1 Mass of phosphorous in original sample 1 mol Mg NH4 PO4 6H2O 30 97 g P 1 mol P 690 g Mg NH4 PO4 6H2O 1 mol Mg NH4 PO4 6H2O 1 mol P 245 5 g Mg NH4 PO4 6H2O of P2O5 in Fertilizer g 141 94 P2O5 mol 0870439919g P 1994676171g P2O5 g 61 94 P mol 1994676171g P2O5 100 21 78 916g of Fertilzer measured Summary KH2PO4 Analysis Data for Gravimetric Method Trial 1 2 3 4 Mass of Sample g 440 440 440 440 Mass of Mg NH4 PO4 6H2O g Mass of P in Mg NH4 PO4 6H2O g Expected P2O5 in sample P2O5 in sample 667 650 643 659 084 082 081 083 43 43 43 43 43 82 42 71 42 25 43 29 Calculations Gravimetric KH2PO4 Trial 1 Mass of phosphorous in original sample 1 mol Mg NH4 PO4 6H2O 30 97 g P 1 mol P 667 g Mg NH4 PO4 6H2O 1 mol Mg NH4 PO4 6H2O 1 mol P 245 5 g Mg NH4 PO4 6H2O of P2O5 in Fertilizer g 141 94 P2O5 mol 0841325255g P 1928186965g P2O5 g 61 94 P mol 1928186965g P2O5 100 43 82 P2O5 44g of Fertilzer measured Spectrophotometric Method Results The Spectrophotometric Method Calibration Curve Volume PO430 1 2 3 working solution mL Concentration of PO43 stock 0 005 0 005 0 005 0 005 solution M Concentration of 4 5 0 005 0 005 P in 10 mL volumetric flask M Absorbance 0 6 00 x 10 6 0 0 204 1 20 x 10 1 80 x 10 2 40 x 10 3 00 x 10 5 5 5 5 0 506 0 687 0 889 1 169 Analysis Performers Name Name Spectrophotometric Method Results Table Mass of Volume Absorbance Concentration of Sample Sample P in 10 mL Sampl g Solution Colored Sample e Used Solution M mL KH2PO4 0 17 3 0 366 0 0054020546 KH2PO4 0 17 5 1 002 0 0088735388 Average Fertilizer 0 35 1 0 435 0 0094327348 Fertilizer 0 35 3 1 034 0 0074739064 Fertilizer 0 35 5 1 951 0 0084612716 Average Fertilizer 0 351 1 0 020 Fertilizer 0 351 3 0 179 5 847953216 x 10 4 0 0017446394 Fertilizer 0 351 5 0 406 0 002374269 Average Mass of P in 250 mL Sample Solution g Expected P2O5 in Sample P2O5 in Sample 0 0418 254074 0 0687 033741 0 0552 643908 52 2 56 38 52 2 92 61 Average 74 49 24 47 82 24 37 89 24 42 89 Average 42 87 24 2 96 24 8 82 24 12 00 Average 7 93 0 0730 329495 0 0578 667202 0 0655 113952 065470 355 0 0045 277778 0 0135 078704 018382 7777 012139 4753 Calculations Spectrophotometric KH2PO4 Volume sample 1 Name Name Concentration of P in 10 mL Colored Sample Solution M 0 366 10 250 0 0054020546 M 18820 1 3 Mass of P in 250 mL Sample Solution g 0 0054020546 250 30 97 0 0418254074 g P2O5 in Sample 1 mol PO 141 94 0 0054020546 250 0958459537 2 mols P 1 mol 0958459537 100 56 38 17 Spectrophotometric Fertilizer Volume sample 1 Name Name Concentration of P in 10 mL Colored Sample Solution M 0 435 10 250 0 0094327348 M 38430 1 3 Mass of P in 250 mL Sample Solution g 0 0094327348 250 30 97 0 0730329495 g P2O5 in Sample 1 mol PO 141 94 0 0094327348 250 1673602972 2 mols P 1 mol 1673602972 100 47 82 35 Spectrophotometric Fertilizer Volume sample 5 Name Name Concentration of P in 10 mL Colored Sample Solution M 0 406 10 250 0 002374269 M 28500 5 3 Mass of P in 250 mL Sample Solution g 0 002374269 250 30 97 0 0183827777 g P2O5 in Sample 1 mol PO 141 94 0 0183827777 250 3261564339 2 mols P 1 mol 0421254677 100 12 00 351