SPECIFICATIONS

SODIUM THIOSULFATE PENTAIHYDRATE ACS

CAS No:				10102-17-7

Formula:				Na2S2O3 * 5H2O

F.W.:					248.19

Description				Colorless solid

Assay					99.5 – 101.0 %

pH of a 5% solution		6.0 – 8.4 at 25 deg. C

Insoluble matter			0.005 % maximum

Sulfate and Sulfite (as SO4)	0.1% maximum

Sulfide (S)				To Pass Test

Effective: 10/26/15