リン酸ナトリウム 二塩基性

InChI

1S/2Na.H3O4P/c;;1-5(2,3)4/h;;(H3,1,2,3,4)/q2*+1;/p-2

InChI key

BNIILDVGGAEEIG-UHFFFAOYSA-L

agency

meets analytical specifications of BP, meets analytical specifications of Ph. Eur., meets analytical specifications of USP

grade

puriss.

assay

98-100.5% (calc. to the dried substance)

form

powder

quality

meets analytical specification of Ph. Eur., BP, USP, FCC, E 339

impurities

reducing matter, complies, residual solvents, complies, ≤0.001% heavy metals (as Pb), ≤0.002% ammonium (NH₄), ≤0.2% water-insoluble matter, ≤1% NaH₂PO₄ (calc. to dried subst.), ≤2.0% pyrophosphate (as Na₄P₂O₇)

loss

≤1% loss on drying, 105°C, 4h, ≤1% loss on drying, 130 °C

pH

8.4-9.6 (20 °C, 1%)

pKa (25 °C)

(1) 2.15, (2) 6.82, (3) 12.38 (phosphoric acid)

solubility

H₂O: soluble 8 parts, H₂O: very soluble (Hot), alcohol: insoluble

anion traces

chloride (Cl^-): ≤50 mg/kg, fluoride (F^-): ≤10 mg/kg, sulfate (SO₄^2-): ≤200 mg/kg

cation traces

As: ≤2 mg/kg, Cd: ≤1 mg/kg, Cu: ≤10 mg/kg, Fe: ≤20 mg/kg, Hg: ≤1 mg/kg, Pb: ≤4 mg/kg, Zn: ≤10 mg/kg

suitability

complies for appearance of solution

Quality Level

200