vapor pressure

<0.1 hPa ( 20 °C)

Quality Level

100

grade

puriss.

Assay

99.0-100.5% (calc. to the dried substance)

form

crystalline

quality

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

impurities

acidity or alkalinity, complies
residual solvents, complies
≤0.001% heavy metals (as Pb)
≤0.04% free alkali (as NaOH)
≤0.05% free acid (as H₂SO₄)

loss

≤0.5% loss on drying, 130 °C

pH

5.2-8 (20 °C, 50 g/L)

mp

884 °C (lit.)

density

2.68 g/mL at 25 °C (lit.)

anion traces

chloride (Cl^-): ≤0.02%

cation traces

As: ≤0.0002%
Ca: ≤0.005%
Fe: ≤0.005%
Mg: ≤0.005%
Zn: ≤0.03%

suitability

complies for appearance of solution

SMILES string

[Na+].[Na+].[O-]S([O-])(=O)=O

InChI

1S/2Na.H2O4S/c;;1-5(2,3)4/h;;(H2,1,2,3,4)/q2*+1;/p-2

InChI key

PMZURENOXWZQFD-UHFFFAOYSA-L