Code: F10243960
Typically it is available as the white or colorless pentahydrate, Na2S2O3·5H2O. The solid is an efflorescent (loses water readily) crystalline substance that dissolves well in water.
per 2.5L
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Sodium Thiosulfate Solution 0.1M (0.1N), NIST Standard Solution Ready To Use, for Volumetric Analysis