- Synonyms: Dipotassium hydrogen phosphate, Potassium phosphate dibasic - K2HPO4 - M = 174,18 g/mol - CAS [7758-11-4] - EINECS-No.: 231-834-5 - Solub. in water: (20 ºC): soluble - Tariff number: 2835 24 00 00 - Applications: analytical chemistry, in buffer solutions (phosphates), nutrient media for bacterial culture. SPECIFICATIONS assay (acidimetric, on dried sample): min. 99,0 % identity (IR-spectrum): passes test insoluble in water: max. 0,01 % pH (5 %, H2O): 8,5 - 9,6 chlorides (Cl): max. 0,003 % sulfates (SO4): max. 0,005 % nitrogen compounds (as N): max. 0,001 % heavy metals: max. 5 ppm iron (Fe): max. 0,001 % sodium (Na): max. 0,05 % loss on drying (105 ºC): max. 1,0 %