|
molecular formula: na2hpo4·12h2o
molecular weight: 358.14
cas no:
properties: colorless semi-transparent crystal or white powder. specific gravity is 1.52. melting point is 34.6℃. soluble in water and insoluble in alcohol. weathering in the dry air. it loses all water of crystallization at 100℃ and breaks up into sodium pyrophosphate at 250℃.
uses: as analytical reagent, ph reagent, boiler water softener, food additive, culture agent for penicillin and streptomycin.
standard: the maximum content of impurities is in percentage content
| specifications/item |
analytically pure-ar
|
chemically pure-cp
|
high purity
|
for water treatment
|
|
assay(na2hpo4·12h2o)/%
|
≥99.0
|
≥98.0
|
≥98.0
|
≥98.0
|
|
clarity test
|
qualified
|
qualified
|
－
|
－
|
|
water insoluble matter
|
≤0.005
|
≤0.01
|
≤0.05
|
≤0.05
|
|
chloride(cl)
|
≤0.001
|
≤0.003
|
≤0.014
|
≤0.05
|
|
sulfate(so4)
|
≤0.01
|
≤0.03
|
≤0.25
|
≤0.5
|
|
nitrogen compound(n)
|
≤0.002
|
≤0.005
|
－
|
－
|
|
potassium (k)
|
≤0.01
|
≤0.1
|
－
|
－
|
|
iron (fe)
|
≤0.0005
|
≤0.001
|
－
|
－
|
|
arsenic (as)
|
≤0.0005
|
≤0.002
|
≤0.0005
|
≤0.005
|
|
heavy metal (pb)
|
≤0.0005
|
≤0.001
|
≤0.002
|
－
|
|
fluoride(f)
|
－
|
－
|
≤0.005
|
≤0.10
|
packing: woven bag lined with plastic bag, kraft bag, or fiber drum, net weight is 25kg.
|