Monobasic Sodium Phosphate, Monohydrate, Granular, USP, BPTest Specification Min Max ASSAY (NaH[@2@]PO[@4@]; ANHYDROUS BASIS) 98. 0 100. 5 % pH OF A 5% SOLUTION (ACIDITY) 4. 2 4. 5 LOSS ON DRYING 11. 5 14. 5% WATER DETERMINATION 10. 0 15. 0% INSOLUBLE SUBSTANCES 0. 2% CHLORIDE (Cl) 0. 014% SULFATES (SO[@4@]) 300 ppm Al, Ca, & RELATED ELEMENTS TO PASS TEST TO PASS TEST ARSENIC (As) 2 ppm ELEMENTAL IMPURITIES AS REPORTED AS REPORTED IRON (Fe) 10 ppm CLARITY AND COLOUR OF SOLUTION TO PASS TEST TO PASS TEST